单项选择题
A.20%-25% B.30%-35% C.50% D.30%-70%
A.70% B.90% C.85%
A.制冷剂 B.载冷剂 C.润滑剂
A.0.15-0.25MPA B.0.35-0.40MPA C.0.28-0.35MPA
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