【单选题】
群集式千斤液压提升初次起吊，当工件试吊时，需要停置观察___分钟，注意各起吊索具的受力情况以及液压泵的压力表，如果索具受力均匀，压力表读数无大幅度波动，就可以正常起吊。
A. 5~10
B. 10~20
C. 20~30
D. 30~60
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答案
D
解析
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履带式打挖掘机短距离转移地工地时，每行走___应对行走机构进行检查和润滑。
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钢筋切断机切短料时，手和切刀之间的距离应保持在___以上，如手据握端小于400mm时，应采用套管或夹具。
A. 150mm
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塔式起重机最基本的工作机构包括___。
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B. 起升机构，限位机构、回转机构和行走机构
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当起重量大于相应挡位的额定值并小于额定值的110％时，___应当动作，使塔机停止提升方向的运行。
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Refer to the exhibit， A Network Secur ity administrator check the ASa firewall NAT policy table rith show nat command， which statement is fails？___
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How can you mitigate attacks in which the attacker attaches more than one vLan tag to a packet？___
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Which component of a bYod architecture provides aAa services for endpoint access ?___
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Which description of the use of a private key is true ？___
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Which statement represents a difference between an access list on an aSa versus an access list on a router？___
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Which command do you enter to verify the status and settings of an iKE Phase 1 tunnel？___
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【单选题】
Which feature can help a router or switch maintain packet forwarding and protocol states despite an attack or heavy traffic load on the router or switch？___
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Which STP feature can prevent an attacker from becoming the root bridge by immediately shutting down the interface when it receives a BPDU？___
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Which technology can best protect data at rest on a user system？___
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choose five___
A. MD5————————inserure
B. DES————————insercure
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Drag the recommendation on the left to the Cryptographic algorithms on the right， Options will be used more than once.___
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Which two commands are used to implement Resilient lOS Configuration ___
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D.
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【多选题】
What are two limitations of the self-zone policies on a zone-based firewall？___
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Which two descriptions of TACACS+ are true？ ___
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【多选题】
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【多选题】
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【多选题】
Which two ESA services are available for incoming and outgoing mails ？___
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What are two reasons to recommend SNMPv 3 over SNMPv2？___
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E. SNMPv2 is secure because you can configure authentication and privacy
