【单选题】
第1620题:___具有浮头式换热器的优点,又克服了固定式换热器的缺点。结构较浮头简单、制造简便、易于检修清洗。
A. 填料函式换热器
B. 螺旋折流板换热器
C. 管壳式换热器
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第1621題:乙烯装置消防栓应按建筑防火规范设定:通常消防栓端口压力应高于___MpA.
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第1622題:离心泵在启动前未充满液体,泵壳内存在空气,吸入口处形成的负压不足以将液体吸入泵内,泵虽启动但不能输送液体的现象称为___。
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第1623题:除所有大中型危险化学品企业外,不具备建立专职救援队条件的其他危险化学品企业、必须建立___救援队。
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第1624:设备密封泄露属于___排放。
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第1625题:含有或直接沾染危险废物的弃包装物、容器、清洗杂物为___。
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第1626题:离心压缩机转速越高,防喘振流量越___。
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第1627题:压力表的量程应为工作压力的___倍。
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第1628题:正在运行的裂解炉,汽包遇到___情况是不需要立即停炉处理
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第1629題:存放危险废物的场所必须设置___。
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第1630题:螺杆泵启动时( )将出口阀关死,___用出口阀调节流量。
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第1631题:裂解炉点火前测爆时,可燃气体浓度小于___%、测爆合格。
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第1632题:乙烷原料中硫含量过低,其结果可能是___。
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第1633题:安全生产五要素是指___,
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第1634题:密封油泵的水压试验保压时间至少___min。
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第1635题:现场处置方案应当包括危险性分析、可能发生的事故特征、应急处置程序、应急处置要点和___等内容。
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第1636题:有组织排放污染物浓度可以比无组织排放浓度___。
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第1637题:进入塔器内作业时,有机物含量应小于___%。
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第1638题:下列___属于易燃气体。
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第1639題:不能用于擦洗设备的是___。
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第1641題:关于乙烯装置设备的防腐措施,说法错误的是___。
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第1643题:压缩机检修后,进行空试前必须保证___工作正常,防止磨损压缩机轴瓦。
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第1645题:对于容易产生静电的设备、管道及构架等,所有这些静电接地设施必须保持完整无损,定期测定电阻值,其电阻值要求不大于___Ω。
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第1646题:编制防震减灾___,应当遵循统筹安排、突出重点、合理布局、全面预防的原则,以震情和震害预测结果为依据,并充分考虑人民生命和财产安全及经济社会发展、资源环境保护等需要。
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Margaret Broe -Fitzpatrick finds it impossible. ___
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The main problem people may encounter today arises from the fact that . ___
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From the passage we can infer that _______. ___
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Which of the following is NOT an advantage of distance learning? _________ ___
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Good distance learning program have the following characteristic EXCEPT______. ___
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Which of the following is NOT true about credit cards? ____________ ___
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