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環境保護 毎日1枚 9.15参加特典 3問正解でさらに5

2016-09-15View Original

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皆様の中秋の節句をお祝い申し上げます。単一選択問題:爆発性粉塵が存在する環境では、絶縁導線や( )を使用して明設することは厳禁です。A. プラスチック管 B. 鋼管 C. ステンレス管 D. 酸化亜鉛鋼管 .A
Reply #22016-09-15
爆発性粉塵環境下では、絶縁導線または(A)の露出配線の使用は厳禁である。A. プラスチック管 B. 鋼管 C. ステンレス管 D. 鍍鋅鋼管 .

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