单项选择题
A.0~1.0 B.1.0~2.5 C.1.5~3.0 D.2.0~3.5
A.0.5~2.0mm B.1.0~2.0mm C.1.5~2.0mm D.大于2.0mm
A.5° B.10° C.15° D.30°
A.7.5° B.15° C.22.5° D.30°
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