问题
问答题 简答题
离心泵运行时，因液体通道不畅引起水力冲击引起泵振动的主要原因是什么？
答案
参考答案：
①离心泵出口阀门开度太小；②离心泵吸入管道进气或有杂物；③开泵时空气未排尽，运行形成气囊，使管道压力产生波动。
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离心泵运行时，因液体通道不畅引起水力冲击引起泵振动的主要原因是什么？
参考答案：
①离心泵出口阀门开度太小；②离心泵吸入管道进气或有杂物；③开泵时空气未排尽，运行形成气囊，使管道压力产生波动。
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| 1. If you want to go to Betty and Jack,s party, you can call ___ . | |||
| A. 342-1525 B. 342-7391 C. 342-2691 D. 342-7350 | |||
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| A. he wants to buy a new one B. he will go abroad C. he wants to buy a new house D. There's something wrong with it | |||
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| A.8 hours B.10 hours C.12 hours D.20 hours | |||
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