单项选择题
A.1：4或1：6 B.1：2 C.1：6 D.1：8
A.8.38mm B.6.45mm C.11.40mm D.9.65mm
A.3.50~7.62m B.4.88~7.62m C.5.20~7.62m D.5.20~8m
A.0.5% B.0.4% C.0.6% D.0.8%
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