单项选择题
A.90% B.92% C.96% D.98%
A.10% B.15% C.20% D.25%
A.表面较平整 B.厚度不小于150mm C.尺寸较大 D.有锋棱锐角
A.0.1 B.0.2 C.0.3 D.0.4
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