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["浄化安全一題",9223, "この投稿は最新の編集は 291hai8487" 于 "22219 "24 08:13 までです 。選�択問題:溶接場所所 �周囲( ) ) �メートル範囲内に易 �易燃易爆物品が存在してはなりません 。 A、3 B、5 C、8 D、" " D"]

2019-09-24View Original

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本帖最后由 hai8487 于 2019-9-24 08:23 编辑 选择题: 焊割场地周围( )米范围内不准有易燃易爆物品。 A、3 B、5 C、8 D、10 D

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