单项选择题
影响磨削加工后表面粗糙度的因素包括() The factors affecting the surface roughness of the ground surface include ( ).
A、砂轮的粒度 Grinding wheel size
B、砂轮的硬度 Hardness of grinding wheel
C、砂轮的组织 Structure of grinding wheel
D、磨粒的材料 Abrasive material
E、砂轮的修整 Dressing of grinding wheel