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2017-12-20View Original

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Reply #22017-12-20
Translate the following from Chinese to Russian:
Reply #32017-12-20
单选题:往复泵开车过程中,下列操作正确的是( )。A.启动前开出口阀A启动后开入口阀 B.启动前开入口阀A启动后开出口阀 C.启动前入口阀出口阀均打开 D.启动前入口阀出口阀均关闭 答案:C
Reply #42017-12-20
C.启动前入口阀出口阀均打开

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