工芸基礎知識（選択問題）20181020
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冷媒をR12の代わりにR22にする主な理由はです。 A．安価 B．軸動力を低減できる C．凍結による詰まりが起きにくい D．オゾン層への影響が少ない
D．オゾン層破壊軽微#こちらで迅速に返信#
D．オゾン層破壊が軽微
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