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
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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。
实现()就是中华民族近代最伟大的中国梦。
A. 祖国统一
B. 全面建成小康社会
C. 中华民族伟大复兴
D. 共产主义