题目内容
(请给出正确答案)
提问人:网友kknd2003
发布时间:2022-01-07
[主观题]
Before contestants take part in provincial contests, their face to face training will be at least 400 hours.
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A、38%
B、93%
C、7%
D、55%
Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? l.Its discharge is continuous; ll.It has no internal valves: lll.Upon accidental closing of discharge valve, excessive pressure will not build up()
A.l, ll
B.ll, lll
C.l ,ll.III
D.llonly
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