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["일일 문제解答,正确即奖,重在娱乐",,"1泵 작동 전에 泵을 액체로 충전하고 ()를 닫아 역류를 방지해야 합니다. A、입구 밸브 B、출구 밸브 C、입구와 출구 밸브 昨일 문제 정답:B 11孔、轴之间有一定过盈配合时,采用热胀配合法装配,将(B )加热使其胀大。A、축 B、구 C、구와 출구", 昨일 문제 정답:B"]

2019-11-19View Original

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17.离心泵启动前应将泵灌满液体,且关闭(),以防倒灌。?A、入口阀??B、出口阀??C、进口和出口阀? 昨天一题答案:B 16.采用热胀配合的装配,当孔、轴配合有一定过盈值,将(B )加热,使之胀大。? A、轴B、孔???C、孔和轴?

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