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工芸基礎知識(選択問題)201812 1

2018-12-01View Original

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冷凍装置の気密試験は、で行うのが最適です。 A.N2 B.O2 C.空気 D.フロン
ヒント:安全で水分を含まず、かつ安価なボトル入りガスを選んでください。

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