工芸基礎知識（選択問題）20181129
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システム内に残っている冷媒をすべて取り出すには、一般的に鋼製ボンベを接続します。 A．充填弁 B．排出多用途チャネル C．吸込多用途チャネル D．排出弁
b、流れがわからない、勉強中です
B~~~~~~~~~~~
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