单项选择题
A.30℃ B.25 C.0℃ D.4℃
A.0.1 MPa B.0.15 MPa C.0.20MPa D.0.25MPa
A.20:1 B.80:1 C.100:1 D.10:1
A.95% B.80% C.40% D.60%
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