工芸基礎知識（選択問題）20181025
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フロン冷凍装置の冷却油を開放状態で保管する際、最も心配なのは。 A．不純物の混入 B．酸化による変質 C．水分の混入 D．空気の混入 ヒント：開放状態で保管すると水分が混入し、氷詰まりを引き起こす。
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