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