在选择粗基准时,首先保证工件加工表面与不加工表面间的位置要求时,则应以 为基准。 If there is position accuracy requirement between the machining surface and non-machining surface, the rough locating datum should select 。
A、不加工表面 Non-machining surface
B、加工表面本身 Machining surface
C、精基准 Accurate datum surface
D、三者都对 All the three options are correct.
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