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毎日1問、正解しても賞品なし、楽しみが目的

2019-12-10View Original

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往復式圧縮機のシリンダーの上死点と下死点のバランス調整は()を用いて行うことができる。A、スライダー B、ピストン C、ピストンロッドのカバー 昨日の問題の答え:B 37.機械ポンプのメカニカルシールのスプリングの回転方向は、軸の回転方向と()でなければならず、これにより回すほど締まるようになる。?A、同じ B、反対

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