工芸基礎知識（選択問題）20181127
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0461 冷凍装置は、以下の操作において、①冷媒を添加する；②潤滑油を加える；③空気を抜く；④気密試験；⑤システム排気；⑥冷媒を取り出す際、排出弁が多用されるチャネルはです。 A．①③⑤⑥ B．③④⑥ C．③④⑤⑥ D．③⑤⑥
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