工芸基礎知識（選択問題）20181128
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圧縮式冷凍装置の以下の操作①冷媒の充填；②冷媒を取り出す；③気密試験；④抜き取りシステム；⑤潤滑油を加える；⑥排気は、充填弁を通じて行うことができます。 A．①③ B．①②③ C．①②③④ D．全部
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