单项选择题
A.10 B.20 C.30 D.40
A.60％～70% B.70％～80% C.80％～95% D.98％～99％
A.0.05MPa B.0.1MPa C.0.15MPa D.0.2MPa
A.1/4 B.1/8 C.1/16 D.1/20
微信扫一扫,加关注免费搜题
