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【单选题】
（单选）离心泵停运时要 ( )
A.
先关出口阀后断电
B.
先关出口阀或先断电均可
C.
先断电后关出口阀
D.
如图所示，离心泵的以下各种安装方式中，哪种合适 （）
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】What is the main aim of book review? （单选）
A.
analyzing a perspective or argues a point
B.
analyzing or discussing researches previously published by others
C.
summaries and comments on a newly published academic book
D.
summaries, reviews and comments the research trends, the major discoveries, significant findings, the leading opinions on a particular subject.