切削加工时产生带状切屑的优点是()。
A.切削力波动小
B.加工表面光洁
C.在保证质量的前提下,生产效率可以提高
D.有利于切屑的排除
E.切削热量小
F.切削阻力小
参考答案:A, B
Jay is one of _____ in China. [ ]
A. a popular singer
B. more popular singers
C. the most popular singer
D. the most popular singers