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毎日1問、正解しても賞品なし、楽しみが目的

2019-12-20View Original

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48. カップリングの加熱による組み立てにおいて、特別な技術的要件がない場合、炎による加熱の最高温度は()を超えてはならない。?A、200℃ B、300℃ C、400℃ 昨日の問題の答え:B 47.スラスト軸受の研磨は、主軸受の研磨()の後に行わなければならない。?A、前 B、後 C、同時

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