刷题
导入试题
【多选题】
对于离心泵而言,改变___可以提高该泵的扬程。
A. 泵的额定转速
B. 叶轮直径
C. 输送流体密度
D. 改变叶片的弯曲程度
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答案
ABD
解析
暂无解析
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往复泵调节流量的方法有___。
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B. 调节出口阀的开度
C. 调节旁路阀的开度
D. 调节泵的冲程
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碳二加氢辅助干燥器充压速度过快,波动较大的是___。
A. 碳三加氢反应器
B. 高压脱丙烷塔回流罐液位
C. 低压脱丙烷塔
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低温离心泵开车前入口阀出口阀的状态是。___
A. 入口阀开
B. 入口阀关
C. 出口阀微开
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离心泵启动后,应注意检查___等。
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B. 泵的转向
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安全阀按照气体排放方式分类,可分为___。
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安全阀按气体排放方式可分为__、__和__三种。___
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离心泵的完好标准有___。
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离心泵的完好标准中明确规定:离心泵的技术资料中应包括___。
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一台完好的精馏塔,必须具备的条件有___。
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反应器设置超温联锁的意义有___。
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下列各选项中,___属于往复泵试车前的准备工作。
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下列属于离心泵汽蚀的原因的有___。
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关于干燥器出口水分不合格的原因,下列说法正确的是___。
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关于聚合级丙烯产品的规格,下列各项正确的是___。
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关于干燥器出口水分不合格的原因,下列说法正确的是___。
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干燥器再生前导液不彻底会造成___。
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【多选题】
精馏塔灵敏板、釜温提不起来的原因有___。
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造成塔压波动的原因有___。
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