【多选题】
A Fault Tolerance (FT) virtual machine with four vCPUs is experiencing high latency when performing ICMP and Application tests. What are three potential causes that may be attributing to this latency? (Choose three.)___
A. The FT network has insufficient bandwidth and is running on a 1GB Link.
B. The FT network is on a particularly high latency link.
C. The FT network has been configured with Network I/O Control.
D. The FT virtual machine is running an e1000 network adapter.
E. The
F. T virtual machine is running on poor performing network-based storage.
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ABC
解析
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相关试题
【多选题】
A virtual machine is experiencing performance issues. The following performance metrics are observed: <CPU usage value for the virtual machine is above 90%> < CPU ready value for the virtual machine is above 20%> Which two activities will likely resolve the performance issues? (Choose two.)___
A. Set a CPU reservation for the virtual machine.
B. Increase the CPU limit on the virtual machine.
C. Decrease CPU shares equally for all virtual machines on the host.
D. Increase CPU shares equally for all virtual machines on the host.
【多选题】
An administrator is upgrading a vSphere Distributed Switch. The existing switch is version 6.0 and the administrator wants to upgrade to the latest version possible. The environment contains several ESXi 6.1 hosts. Which two options are available to ensure that the upgraded switch will be compatible with these hosts? (Choose two.)___
A. Upgrade the vSphere Distributed Switch to 6.0
B. Upgrade the ESXi 5.5 hosts to version 6.0, then upgrade the vSphere Distributed Switch to 5.5
C. Upgrade the vSphere Distributed Switch to 5.1
D. Upgrade the
E. SXi host switches to 5.5, then upgrade the vSphere Distributed Switch to 5.5
【多选题】
An administrator attempts to create a Thick Provisioned Virtual Disk (VMDK) on an NFS datastore; but it fails. Which two reasons would explain the failure? (Choose two.)___
A. Datastore is on an NFS 3 storage server that does not support Hardware Acceleration
B. Datastore is on an NFS 4.1 storage server
C. Only VMFS datastores support "Thick Provisioned" VMDK
D. The NFS datastore was not created on a "Thick Provisioned" device
【多选题】
Which two NFS Protocol versions does vSphere 6 support? (Choose two.)___
A. Version 3
B. Version 3.1
C. Version 4
D. Version 4.1
【多选题】
Which three operations occur during a cold migration of a virtual machine? (Choose three.)___
A. The virtual machine disks are moved if the datastore is being changed.
B. The virtual machine is registered with the destination server.
C. The source virtual machine is removed from the old hosts.
D. The virtual machine hardware is upgraded.
E. The virtual machine files are quiesced prior to the migration.
【多选题】
A 4 GB Memory virtual machine is experiencing extended memory issues, as shown in the Exhibit. What potential issues could be attributed to this memory pressure?___
A. A limit is imposed on the virtual memory of this virtual machine.
B. The Balloon driver has been uninstalled.
C. A limit has been imposed on the Virtual CPU of the virtual machine.
D. Storage IO control has been enabled for the virtual machine causing the swapped memory.
【多选题】
You are creating a virtual machine in the Web Client using the New Virtual Machine wizard. Which two steps are required? (Choose two.)___
A. Select a valid name.
B. Select a cluster for the compute resource.
C. Select a network adapter.
D. Select the virtual machine compatibility.
【多选题】
An administrator has been given requirements to configure vMotion for a new virtual machine. The configuration should: <Provide Network Redundancy Use VLAN 550> <Be secured against anyone trying to spoof communication The vSwitch1 configuration is shown in the Exhibit.> Which three changes should be made to meet the stated requirements? (Choose three.)___
A. The VLAN ID must be set appropriately.
B. The default values for MAC Address Changes and Forged Transmits must be altered.
C. The teaming and failover adapters must be set appropriately.
D. The Traffic Shaping configuration must be altered.
E. The Load Balancing Policy must be set appropriately.
【多选题】
Which three traffic types are available services options when configuring a vmkernel port? (Choose three.)___
A. Provisioning Traffic
B. Virtual Volumes Traffic
C. vSphere Replication NFC Traffic
D. Virtual SAN Traffic
E. FCoE Traffic
【多选题】
An administrator logs into the vSphere Web Client, but is unable to see any hosts and clusters. Which two options could fix the problem? (Choose two.)___
A. Verify that the client web browser and vCenter Server are in the same broadcast domain.
B. Verify that the vCenter Server system is registered with the same Platform Services Controller as the vSphere Web Client.
C. Log in to the vCenter Server as a user within the Active
D. irectory domain.
【多选题】
Which three VLAN Tagging modes are available in vSphere 6.x? (Choose three.)___
A. External Switch Tagging
B. Private VLAN Tagging
C. Virtual Switch Tagging
D. VXLAN Tagging
E. Virtual Guest Tagging
【多选题】
Which two statements are true about VMFS5 datastores on ESXi 6.x? (Choose two.)___
A. Virtual Disk (VMDK) size can be larger than 2TB.
B. Datastore extent size can be larger than 2TB.
C. Only Physical Mode Raw
D. evice Map (Passthrough-RDM) can be larger than 2TB.
【多选题】
Which two statements are correct when turning off a Distributed Resource Scheduler (DRS) Cluster? (Choose two.)___
A. The resource pool hierarchy of the DRS cluster is maintained.
B. The resource pool hierarchy of the DRS cluster is removed.
C. The affinity settings of the
D. RS cluster are removed and not maintained when DRS is re-enabled.
【多选题】
An administrator is creating a new Virtual SAN cluster on a Layer 2 network. There is an existing Virtual SAN cluster on the same Layer 2 network. Which two actions would allow the new Virtual SAN cluster to coexist with the older cluster? (Choose two.)___
A. Change the default Multicast Address on the new Virtual SAN cluster.
B. Change the default Unicast Address on the new Virtual SAN Cluster.
C. Create a separate VLAN for each cluster.
D. Create an ARP Alias for the Virtual SAN VMkernel Network Adapter.
【多选题】
A vCenter Operations Manager 5.7 environment is upgraded to vRealize Operations. After the upgrade, the analytics services fail to start. Which three steps must be taken to resolve the problem? (Choose three.)___
A. Take the vRealize Operations cluster offline.
B. Delete the activity persistence files.
C. Bring the cluster back online.
D. Remove any unresponsive nodes.
E. Stop the CaSA service.
【多选题】
An organization has an ESXi 6.x host that contains two resource pools. The host is being relocated to a DRS cluster. What two actions can be taken to integrate the host into the cluster, and what would happen to the existing ESXi resource pool hierarchy as a result? (Choose two.)___
A. Place all of the host's virtual machines into the DRS cluster root resource pool. The resource pools present on the host will be deleted.
B. Create a resource pool for the ESXi host's virtual machines and resource pools. The resource pools present on the host will be deleted.
C. Place all of the host's virtual machines into the DRS cluster root resource pool. The resource pools present on the host will be preserved.
D. Create a resource pool for the
E. SXi host's virtual machines and resource pools. The resource pools present on the host will be preserved.
【多选题】
Which two parameters are required when adding an iSCSI target to an iSCSI Software Adapter using Dynamic Discovery? (Choose two.)___
A. The iSCSI device's IP Address or Fully Qualified Domain Name
B. The Port Number
C. The iSCSI device's iSCSI Qualified Name (IQN)
D. The Default Gateway IP Address
【多选题】
Which two SMTP Notification Event Details are specific to alarms triggered by events? (Choose two.)___
A. User Name
B. Summary
C. Old Status
D. Target
【多选题】
Which two High Availability ___ Cluster admission control policies can help avoid resource fragmentation? (Choose two.)(AC)
A. Define failover capacity by static number of hosts
B. Define failover capacity by reserving a percentage of the cluster resources
C. Use dedicated failover hosts
D. Use Virtual Machine Monitoring
【多选题】
An attempt to enable vSphere Fault Tolerance for a powered-on virtual machine fails. Which two scenarios would result in this failure? (Choose two.)___
A. The virtual machine has three vCPUs configured.
B. The host on which the virtual machine is running has insufficient memory resources.
C. The virtual machine has insufficient resources to accommodate full reservation plus the overhead memory.
D. VMware High Availability is enabled on the cluster of which this host is a member.
【多选题】
A vApp template recently added to a Content Library is not displayed. Which two actions could correct this problem? (Choose two.)___
A. Manually synchronize the library
B. Select the Download all library content immediately option
C. Select the Sync subscribed library option
D. Manually download the vApp template
【多选题】
What are three valid disk configurations for the vSphere Data Protection 6.x Appliance? (Choose three.)___
A. 500GB
B. 1TB
C. 1.5TB
D. 2TB
E. 4TB
【多选题】
Which three connection types are available when configuring a vSwitch in the vSphere Web Client? (Choose three.)___
A. VMkernel Network Adapter
B. Physical Network Adapter
C. Virtual Machine Port Group for a Standard Switch
D. vMotion Network Adapter
E. vSAN Network Adapter
【多选题】
Which three features can be enabled for a new host cluster? (Choose three.)___
A. Storage Distributed Resource Scheduling
B. High Availability
C. Fault Tolerance
D. Distributed Resource Scheduling
E. Virtual SAN
【多选题】
An administrator receives a report that no real time statistics are available for a virtual machine in the vCenter Server inventory. Which two statements indicate likely causes of the problem? (Choose two.)___
A. The virtual machine is powered off.
B. The host containing the virtual machine is disconnected from vCenter Server.
C. There is insufficient real time data to display the information.
D. The vCenter Server service is not running.
【多选题】
Your manager has given you a bash script that retrieves data for ESXi 6.x host configurations. This data needs to be collected right after the installation of a host and must be run directly on the host. Which two actions can be used to run this script on an ESXi host? (Choose two.)___
A. Connect to the host with Ruby vSphere Console and run the script from there.
B. Enable SSH access from the Direct Console User Interface.
C. Enable the ESXi Shell from the
D. irect Console User Interface.
【多选题】
Which two are true about the Risk badge in vRealize Operations? (Choose two.)___
A. The Risk badge indicates potential future problems that may degrade the performance of the system.
B. Risks may require attention in the near future.
C. The Risk badge indicates problems that are degrading performance of the system.
D. Risks require attention now to correct system performance problems.
【多选题】
vSphere Update Manager allows which two virtual machine attributes to be upgraded? (Choose two.)___
A. Virtual machine firewall policies for NSX.
B. Software Packages in the virtual machine.
C. Virtual machine Hardware Version.
D. VMware Tools Upgrade.
【多选题】
What are two benefits of using NFS 4.1 with vSphere 6.x as compared to NFS 3? (Choose two.)___
A. NFS 4.1 supports Kerberos Authentication
B. NFS 4.1 supports multipathing
C. NFS 4.1 supports IPv6
D. NFS 4.1 supports hardware acceleration
【多选题】
Which three statements are true regarding Fault Tolerance? (Choose three.)___
A. Applications need to be continuously available to users.
B. Applications without native clustering capabilities can be protected.
C. Custom clustering solutions are complicated to configure and maintain.
D. Applications that have 16 vCPUs are supported.
E. Prevents application crashes by analyzing the workload and correcting problems.
【多选题】
Which two statements are true regarding VMware vSphere Flash Read Cache (vFRC)? (Choose two.)___
A. Cache fills and cache evictions happen in the granularity of a cache block size.
B. vFRC caches data from both read and write I/Os, but write I/Os are always serviced by the underlying storage.
C. vFRC caches data from both read and write I/Os, but write I/Os are always serviced by the underlying cache data.
D. Cache fills and cache evictions happen in the granularity of the disk block size.
【多选题】
What are two possible causes of Storage Distributed Resource Scheduler (SDRS) being disabled on one or more virtual machine disks in a datastore cluster? (Choose two.)___
A. The virtual machine has vSphere Fault Tolerance disabled.
B. The virtual machine is a template.
C. The virtual machine swap file is on a shared datastore.
D. The disk is a CD-ROM/ISO file.
【多选题】
An administrator attempts to install vCenter Single Sign-On Server. The installer returns an error message indicating that the installation failed. Prior to the installation, all setup prerequisites were met. The administrator has generated a vCenter Server Single Sign-On support bundle. Which two files should the administrator analyze to determine the cause of the failure? (Choose two.)___
A. Server\utils\logs\imsTrace.log
B. Server\utils\logs\install.txt
C. %TEMP%\utils\logs\vminst.log
D. %TEMP%\vminst.log
【多选题】
An administrator is unable to remove an ESXi 6.x host from a vSphere Distributed Switch. What are two likely reasons for this issue? (Choose two.)___
A. Vmkernel interfaces on the switch are still in use.
B. VM Network port group adapters are connected to different switch.
C. Physical NICs are migrated to different switch.
D. VM Network adapters are connected to this switch.
【多选题】
Which two Identity Sources are available to add for vCenter Single Sign-On authentication? (Choose two.)___
A. LocalOS
B. OpenLDAP
C. NIS as an LDAP Server
D. VCMSDS
【多选题】
What are three goals of resource management within a cluster? (Choose three.)___
A. To prevent virtual machines from monopolizing resources and to guarantee predictable service rates.
B. To exploit undercommitted resources and overcommit with graceful degradation.
C. To provide solutions to potential problems that you might encounter when using vCenter Server.
D. To control the relative importance of virtual machines and provide flexible dynamic partitioning.
E. To provide additional network administration capabilities.
【多选题】
Which three actions can be taken as a result of executing the vSphere Update Manager 6.x scan and remediation wizards? (Choose three.)___
A. Install and upgrade software in virtual machines.
B. Upgrade the firmware on ESXi host devices.
C. Upgrade and Patch ESXi hosts.
D. Install and update third-party software on hosts.
E. Upgrade virtual machine hardware.
【多选题】
Which two statements are true about deploying and using vSphere Replication? (Choose two.)___
A. ESXi hosts managed by a single vCenter Server instance require a connection between the two vSphere Replication appliances.
B. Sites managed by different vCenter Server instances require a connection between the two vSphere Replication appliances.
C. Sites managed by different vCenter Server instances require the use of Site Recovery Manager and a connection between the two vSphere Replication appliances.
D. ESXi hosts managed by a single vCenter Server instance require a single vSphere Replication appliance.
【多选题】
An administrator is attempting to power on a virtual machine, but the task is hanging at 95%. What three scenarios best explain why this problem is happening? (Choose three.)___
A. A virtual machine question is currently being posed to the administrator.
B. Another task for the virtual machine or other component is already in progress.
C. The VMware High Availability cluster has insufficient resources to guarantee failover.
D. The host has lost access to the storage device containing the virtual machine files.
E. The host is under resource contention and unable to power on the virtual machine.
【多选题】
Which three features are not supported when using Fault Tolerance in vSphere 6.x? (Choose three.)___
A. Virtual Volumes (VVOLS)
B. Storage vMotion
C. Virtual Machine Component Protection
D. vMotion
E. vSphere Distributed Switches
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简述：在V5.0中已经做完标前成本测算且已经中标的项目，公司系统管理员可以在项目参数管理中，设置投标项目信息，自动获取投标清单。自动获取的投标清单，没有工程量、综合单价、合价等信息。可以直接在系统中录入这些数据，也可以通过以下操作批量录入这些数据，批量操作的步骤有哪些？
【简答题】
简述：原使用成本管理信息系统V2.0的项目，清单分解是项目可以自行分解，编辑分解细目；但是V5.0系统清单分解项必须从企业定额中选择，针对这种情况，原使用V2.0的项目，该怎么操作？
【简答题】
某施工单位承建客运专线某隧道工程，起讫里程为DK38+500～DK42+100，长度为3600m。合同为有风险包干费的施工总承包合同，隧道围岩破碎、软弱，地下水发育，围岩级别为IV级，施工中发生了以下事件：
事件1.在DK38+900-DK39+050段施工过程中，现场实际围岩级别为V级，施工增加费用120万元；
事件2.在DK39+670-DK900+050段施工过程中，突发突水突泥事故，造成损失150万元；
事件3.在DK39+670-DK900+050段施工过程中，隧道突然发生塌方，没有造成人员伤亡，但造成50万元的损失；
问题:事件1、2、3按照中国中铁关于印发《工程项目二次经营工作指引》的通知（中铁股份成本﹝2018﹞61号）文二次经营隧道章节要点提示费用该如何处理，，对于各事件1与事件2有没有更好的处理办法？
【简答题】
某新建双线铁路客运专线站前工程第二标段，已知概算编制期单价：水泥（设计用量200吨）360元/t，钢材（设计用量50.0t）3500元/t，碎石80元/t,2018年四季度经规院公布的信息价：水泥420元/t，钢材3570元/t，碎石100元/t。请根据中国中铁关于印发《工程项目二次经营工作指引》的通知（中铁股份成本﹝2018﹞61号）答下述问题：该项目可调材差合计多少元？
【简答题】
某工程第三标段。设计资料显示标段内有正线桥梁 11 座，共有圆端形墩身 89 个，墩身型式有实心、空心两种，墩身坡比分别为35 : 1、38 : 1、42 : 1，其中墩高 30m 以下空心墩 2 个；有2个桥台位于隧道口，施工场地狭窄，交通困难，桩基为钻孔灌注桩，桩径均为 1.25m，桩长分别为12m、14m。根据施工方案，墩身内、外模板均要求采用定型钢模，且不改造后利旧。根据背景资料，此桥有哪些方面可以进行变更设计，如何变更？
【简答题】
某既有铁路需增建二线，施工过程中发生了I类变更设计，DK30+100-Dk32+020段路基改成桥梁：施工单位根据变更新增的工程内容增加了如下临时工程：①新建便道1000m；②大临电力干线1000m：③桥梁钢筋加工棚1座；④临时板房500M2，⑤新建存梁场1座，请问有哪些I类变更新增临时工程费用可能会给予调整，除了上述临时工程还有那些I类变更新增的临时工程可能会给予调整？
【简答题】
某公司（乙方）于某年 4 月 20 日与某厂（甲方）签订了修建建筑面积为 3000㎡工业厂房（带地下室）基础的施工合同。合同约定5月11日开工，5月20日完工。乙方编制的施工方案和进度计划已获监理工程师批准。
在实际施工中发生如下几项事件：
事件一：因租赁的挖土机大修，晚开工2天，造成人员窝工10个工日；
事件二：基坑开挖后，因遇软土层，接到监理工程师 5月15日停工的指令，进行地质复查，配合用工15个工日；
事件三：5月19日接到监理工程师于5月20日复工的指令，同时提出基坑开挖深度加深2m的设计变更通知单，由此增加土方开挖量900m3；
事件四：5月20日～5月22日，因下百年未遇的大雨迫使基坑开挖暂停，造成人员窝工10个工日；
事件五：5月23日用30个工日修复冲坏的永久道路，5月24日恢复挖掘工作，最终基坑于5月30日挖坑完毕。
问题：根据《建设工程工程量清单计价规范》规定，针对上述哪些事件可以索赔，哪些事件不可以索赔，并说明原因
【简答题】
某铁路桥梁工程构造如下：桥墩基础采用直径为 1.5m，桩长 25-30m 的钻孔桩，地质条件为卡斯特溶岩地形以下情况：在钻孔过程中，发现某桩孔在设计桩底位置有一溶岩孔洞（与设计图纸中的土质勘测资料不符），经设计变更，施工采用钻孔填砂，注浆固结，变更增加费用30万元。根据资料，溶岩变更须哪些基础资料？
【简答题】
某铁路承包合同约定采用工程量清单计价方式，本期完成直径 1.5 米钻孔灌注桩 8000 米，合同单价 2400 元，批复的Ⅰ类变更设计 300 万元，施工队伍进场费用 10 万元，购置龙门吊费用 30 万元，租赁预应力张拉设备 5 万元，由于主材价格上涨超过合同约定幅度申请调整价差 15 万元，原方案箱梁过隧道变更为移动模架施工增加措施费 60 万元。根据背景资料，本期验工计价可申报金额是多少？
【简答题】
铁路总承包风险包干费其包含的内容有但不限于：①非不可抗力造成的损失及对其采取的预防措施费用；②非发包人供应的材料、设备除铁总可以调整以外的价差（含自购料价格变化幅度在±5%范围内的价格风险额和地材差等）；③实施性施工组织设计调整造成和增加的措施费；④工程保险费用；⑤由于变更施工方法、施工工艺所引起的费用增加；（相对于投标施工组织设计施工方法及施工工艺）；⑥施工安全、工程质量、建设工期、投资控制、环境保护和维护稳定考核费用；⑦限额以下的承包人承担的Ⅱ类变更设计费用；根据中国中铁关于印发《工程项目二次经营工作指引》的通知（中铁股份成本﹝2018﹞61号），应按照什么原则和顺序来处理？
【简答题】
某市政工程合同约定的调差方式：采用当地造价信息进行价格调整，基期价采用2017年9月的当地价格信息。承包人在已标价工程量清单或预算书中载明的材料单价应等于基准单价的，合同履行期间材料单价涨跌幅以基准单价为基础超过±5 %时，其超过部分据实调整。已知2017年9月钢材基期价3000元/t,商混基期价360元/m3,业主按月对已完合格工程进行计量，预计2018年4-6月每月均衡完成管廊主体1000m3(消耗钢材100吨，商混1000m3)；预测4月份商混单价470元/m3,钢材单价3200元/t，5月份商混单价460元/m3,钢材单价3500元/t，6月份商混单价400元/m3,钢材单价3600元/t，假定项目资金充裕，项目可提前或推迟1月计价，根据已知条件，项目应该如何选择计价才能使价差最大化?
【简答题】
某集团某公司承建位于西南区域的时速为 200km 的客货共线铁路线下工程，铁路全长 196km。施工过程中出现以下事件：
事件1：土石方运距的调整。某段路基土方运距6公里，通过实际调查发现最近的取弃土场在35公里处 ；
事件2：在施工过程中，在某段路基地基处理时，发现一段长约500米的溶岩地段，原设计为二类土，无特殊处理；请问出现上述情况，项目经理部处理的一般方法有哪些？
【简答题】
某市政项目土方工程，承包商在合同标明有松软石的地方没有遇到松软石，因此进度提前1 个月。但在合同中另一未标明有坚硬岩石的地方遇到更多的坚硬岩石，开挖工作变得更加困难，由此造成了实际生产率比原计划低得多，经测算影响工期 3 个月。为此承包商准备提出索赔，根据建设工程施工合同示范文本的相关条款规定请问该项施工索赔能否成立？为什么？在该索赔事件中，应提出的索赔内容包括哪两方面
【简答题】
某公路项目施工图给定了3个取土场，承包单位进场后对1号取土场进行清表挖土，但在清表过程中有多户村民来阻工无法施工，经与业主项目协调办调查后，发现此取土场产权不明，政府无法协调。且清表后并无土而均为红砂岩，项目部在协调办和监理同意的情况下另外找了处取土场。请判断取土场变化后可做哪方面的变更，需要收集哪些资料？
【简答题】
某高速公路1标地处山岭重丘区，在深壑上有一座长860米的特大桥，最高桥墩达25米，施工难度大，工期长并处于关键线上，施工图中路基土石方调配表显示本标段挖填趋于平衡。特大桥和路基土石方同时开工，这样特大桥大里程方向挖方土按调配表需运35km才能对特大桥小里程方向路基段进行填筑。请你从施工进度、施工成本方面来策化路基土石方调配变更。
【简答题】
某高速***标段在防止山体滑坡时采用2*3m抗滑桩设计，投标工程量清单时给出214-1-a子目号，工程数量为448m，中标工程量清单单价16315.97元/m，投标单价含抗滑桩钢筋，但清单中只能看到综合单价，抗滑桩钢筋为357.39t。
在进行工程量清单复核时，项目工经人员通过研究2009版《公路工程标准施工招标文件》下册第107页214.05条中第1款规定，抗滑桩钢筋可以单独计量，作为清单漏项监理同意新增了抗滑桩钢筋清单子目，并按400章桥梁工程基础钢筋403-1-1和403-1-b定价，最终该项增加清单金额235.14万元。
问题：变更成立并已审批计量，你做为审计人员将如何处理，为什么？如被审计扣减，做为项目部工经部长你将找何理由不被扣减？
【简答题】
某高速公路***标段K000+100~K002+200.7段落中一段路基正好阻断了两个村庄的沟通和联系，施工进场入村民阻工要求增加可通行的构造物，业主和设计同意此段做路改桥变更。项目桥梁综合单价分别为：桩基1.2m为1562.5元/m，承台和墩台身470.67元/m3，上部结构604.72元/m3，预制T形梁977.65元/m3。经项目测算，该项目桥梁报价水平偏低。
问题：如果想获得高的利润，你将如何策化重新报价？
【简答题】
中国中铁关于印发《工程项目二次经营工作指引》的通知（中铁股份成本﹝2018﹞61号），某铁路桥梁工程构造如下：桥梁下部结构为一般墩台，上部为一联跨既有铁路的 48+80+48 米连续梁。施工前和施工过程中存在以下情况：应地方政府通航要求，连续梁孔跨调整成42+92+42米，变更后增加费用400万元。根据资料事件2属于哪类变更？
【单选题】
计算机房一般净高在2.5~3米之间，工作区气流速度控制在0.2~0.3M/S，则上送下回百叶侧风口流速的建议取值＿＿。
A. ：1~2M/S
B. ：3~4 M/S
C. ：2~3 M/S
D. ：4~5 M/S
