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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

2019-11-05View Original

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5.遠心ポンプを停止する前に、まず(?????)を閉じなければならない。?A、入口伐??B、出口伐??C、入口、出口伐 昨日の問題の正解は:B 4.カルシウム系グリースは(??B???)という特性を持つ。?A、耐熱 ?B、耐水性 ?C、放熱

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