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2017年7月20日の練習**質問、回答は 0 点から 6 点で採点されます(投稿から 1 日経ってからの返信は採点されません。ご返信いただきありがとうございます)

2017-07-20View Original

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正誤問題(誤答は0点) 密閉スプリング式安全弁で蒸気媒体に適しています。答え:間違っている。
Reply #22017-07-20
使わなきゃいけない、現場ではこんな感じ

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