单项选择题
A.0.1mm B.0.25mm C.0.35mm D.0.4mm
A.2% B.5% C.10% D.15%
A.1%～3.3% B.2%～3.3% C.3%～3.3% D.3.1%～3.3%
A.普通 B.低压 C.中压 D.高压
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