工芸基礎知識（選択問題）20181023
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フロン装置用の冷凍機油は、アンモニア装置用のものよりも優れている必要があります。 A．粘度が低い B．粘度が高い C．引火点が高い D．凝固点が低い ヒント：フロンは油に溶けやすく、これにより冷凍機油の粘度が下がる。
D．凝固点が低い#こちらで迅速に返信#
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