单项选择题
A.凸溜槽 B.凹溜槽 C.平溜槽 D.斜溜槽
A.70°～90° B.50°～70° C.30°～50° D.10°～12°
A.100mm B.200mm C.300mm D.150mm
A.3% B.5% C.7% D.10%
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