That is one of those books that _____ worth reading. [ ]
A. is
B. have
C. has
D. are
答案:D
丝锥的几何参数主要有()。
A.切削锥角
B.前角
C.后角
D.切削刃方向
E.倒锥量
DKJ-2000系统可控制车列在尽头线安全距离前方停车。