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【单选题】
关于泵的下列说法中准确的是____。A.
泵的有效功率即泵传递给液体的功率
B.
泵的总功率是容积效率、水力效率、机械效率之和
C.
泵允许吸上真空度和必需汽蚀余量都可由同样的汽蚀实验求出
D.
泵的允许吸上真空度标示泵的自吸能力
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举一反三
【单选题】He has a/an______similar voice with Douglas. I couldn't believe my ears the first time I heard him talk.
A.
painstakingly
B.
uncannily
C.
ostentatiously
D.
misshapenly
【简答题】完形填空 The other day, I happened to meet someone I hadn't seen for many years. I couldn't believe the change in him. As a matter of fact, he didn't even seem like the __1__ person. When I first knew Bil...
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