单项选择题
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%
A.0.50mm B.0.55mm C.0.45mm D.0.60mm
A.FH B.REG C.IF D.DF
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