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【单选题】
离心泵铭牌上标明的是泵在( )时的主要性能参数。A.
流量最大
B.
压头最大
C.
效率最高
D.
轴功率最小
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】This is a story that happened 15 years ago but it has always stayed with me since then.On the way back from work every evening,more often than not there would be a homeless man standing at the exit o...
【单选题】The old man told us most of the story, but _______ the part about the murder.A．kept upB．kept ba
A.
181. The old man told us most of the story, but _______ the part about the murder. A．kept up
B.
kept back
C.
kept out
D.
kept down
【简答题】阅读理解。 The story is told about two people named David and Rosy Jackson. Both of them had very bad memory. For example, Rosy would forget to cook dinner，or David would go to work on Sunday，thinking it w...
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