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毎日1問、正解しても賞品なし、楽しみが目的

2019-11-21View Original

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19. 空気圧縮機が一次シリンダーに送り込むガスの圧力は、()大気圧である。?A、B未満 B、等しい ?C、Bより大きい?一昨日の問題の答え:B 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、(B)を閉じなければならない。?A、入口弁??B、出口弁??C、入口および出口弁?

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