The slotting machine is mainly used for machining the inner surface of the workpiece, and the main motion is the vertical reciprocal rectilinear motion of the tool.

In the plane problem, the sliding surface is mainly simplified into ____ A: Circular arc B: Rectilinear figure C: Compound D: Dustpan shape

The slotting machine is mainly used for machining the inner surface of the workpiece, and the main motion is the vertical reciprocal rectilinear motion of the tool. A: 正确 B: 错误