单项选择题
A.1.25 B.0.315 C.0.630 D.2.50
A.7.0MPa B.7.7MPa C.9.0MPa D.8.0MPa
A.2% B.1% C.0.3% D.0.1%
A.100×100×400 B.150×150×600 C.150×150×800 D.100×100×550
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