問題詳情

30. Which of the following force acts in the direction of the cutting speed, and supplies the cnergy required forcutting:
(A)thrust force,
(B)friction force,
(C)cutting force,
(D) Normal force, or
(E) all of the above?

參考答案

答案:[無官方正解]
難度:計算中-1
書單:沒有書單,新增