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接触コーキング改質油ブレンドバージョン 20190426

2019-04-26View Original

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参加する:賞品 1 フォーチュン;正解:賞品 3 富。 https://bbs.hcbbs.com/static/image/hrline/2.gif https://bbs.hcbbs.com/static/image/hrline/3.gif 本当か間違っているかの質問:2台のボイラーが下水本管を同時に使用し、各ボイラーの下水管に逆止弁がない場合、2台のボイラーから同時に汚水を排出することは禁止されています。 答え:右 https://bbs.hcbbs.com/static/image/hrline/1.gif https://bbs.hcbbs.com/static/image/hrline/2.gif 注記:答えは2日後に自動的に発表されます。

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