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毎日1問、正解しても賞品なし、娯楽を目的とする

2019-11-19View Original

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17.遠心ポンプを起動する前には、逆流を防ぐためにポンプ内を液体で満たし、()を閉じなければならない。?A、入口弁 ?B、出口弁 ?C、入口弁と出口弁 昨日の問題の正解:B 16. 熱膨張を利用した組み立て法では、穴と軸の間にある程度の過剰な隙間がある場合、(B)を加熱して膨張させる。?A、軸 B、穴???C、穴と軸?

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