单项选择题
A.50mm B.100mm C.150mm D.200mm
A.0.10～0.20 B.0.15～0.25 C.0.20～0.30 D.0.25～0.30
A.0.5% B.1% C.1.5% D.2%
A.50mm～70mm B.60mm～80mm C.70mm～90mm D.40mm～60mm
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