单项选择题
A.1/2-2/3 B.3/4-4/5 C.3/5-4/5
A.1/3 B.2/3 C.1/3-1/2 D.1/3-2/3
A.1.20MPa B.1.50MPa C.1.35MPa D.1.34MPa
A.等熵膨胀 B.节流膨胀
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