单项选择题
A.0.7Mpa B.0.8Mpa C.0.9MPa D.1MPa
A.1:500;1:200 B.1:500;1:300 C.1:800;1:200 D.1:800;1:300
A.40m2 B.50m2 C.60m2 D.70m2
A.0.02MPa B.0.1MPa C.0.5MPa D.1MPa
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