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精製の安全性に関する質問 1016

2019-10-17View Original

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多肢選択問題: 裸火で作業する場合、アセチレンボトルと酸素ボトルの間の安全な距離は ( ) メートル以上にあってはなりませんか? A、5m B、10m C、15m D、30m B

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