题目内容

怎样测定煤粉细度?

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The simplest method to use for determining if a centrifugal pump is operating as designed, is to ().

A. closely observe the pump discharge temperature
B. close off the discharge valve, and watch for a rise in pressure
C. momentarily close off the suction valve, and watch for a rise in pressure
D. use a clamp on ammeter and compare the readings to past record

在Windows中,需要查找以AB开头的所有文件,在查找对话框内的名称框应输入()。

AB*
B. *.AB
C. AB?
D. AB*.*

自动气象站采集器的时钟每天应在()时对时,若误差超过()时,应调整时钟。

水下气割火焰宜用氧炔焰。

A. 正确
B. 错误

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