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单项选择题相同工况下,R717、R22、R12、R134a制冷循环的单位质量制冷量由大到小排序为( )。

A、R717、R12、R134a、R22

B、R22、R134a、R12、R717

C、R12、R134a、R717、R22

D、R717、R22、R134a、R12

  • D
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