单项选择题
A.1m2 B.2m2 C.0.01m2 D.0.1m2
A.0~1.6Mpa,0.5级 B.0~2.5Mpa,0.35级 C.0~4Mpa,0.25级
A.0~1MPa B.0~1.6MPa C.0~2.5Mpa D.0~4.0MPa
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