单项选择题
A.1倍 B.1~1.5倍 C.1.5~1.9倍 D.2~2.5倍
A.0.1mm B.0.2mm C.0.3mm D.0.4mn
A.50% B.60% C.70% D.80%
A.0.5~1倍 B.1.2~2倍 C.2~3倍
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