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毎日1問、正解者には6つの財富が報酬として与えられ、参加者には2つの財富が与えられます;7月2日

2016-07-02View Original

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カルシウムカーバイド法 単一選択問題:アセチレン生成過程において85℃の時、水の気化により粗アセチレンには大量の水蒸気が含まれる。一般的に水蒸気:アセチレン=( ) A、1:2 B、1:3 C、1:1 正解:C、1:1

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