单项选择题
A.25°-20° B.20°-15° C.15°-10° D.10°-5°
A.70°～75° B.75°～80° C.85°～90° D.90°～95°
A.20MM B.25MM C.360MM D.38MM
A.0.005～0.010 B.0.005～0.020 C.0.005～0.030 D.0.005～0.040
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