单项选择题
就原理而言，磨齿加工方法通常分为（ ）磨齿和（ ）磨齿两大类。 In principle , the gear grinding methods are usually divided into ( ) and ( ) .
A、蜗杆砂轮磨齿 grinding with worm abrasion wheel
B、成形砂轮磨齿 forming grinding method
C、碟形砂轮磨齿 grinding with dish abrasion wheel
D、范成法磨齿 generating grinding method
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