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接触コーキング改質油ブレンドバージョン 20190921

2019-09-22View 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 多肢選択問題:ボイラーの電気化学腐食の原因は、給水中の ( ) の存在です。A. 水素 B. 窒素 C. 酸素 D. 浮遊物質 答え: C 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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