单项选择题
A.15 B.30 C.20 D.60
A.0.8MPa B.1.0MPa C.0.6MPa D.1.25MPa
A.80℃ B.100℃ C.50℃ D.120℃
A.16%~21.5% B.19%~21.5% C.14%~21.5% D.20%~21.5%
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