the movements required for gear processing on the gear shaper are::
选项：

A:插齿刀的上下往复——主运动 reciprocal motion of the slotting cutter--main motion;
B:让刀运动 motion of the cutter relieving ;
C:圆周进给运动 Circular feed motion;
D:Generating Motion;
E:Radial cut-in motion