用所给单词的适当形式填空。

1. I think this song is _____ (popular) than that one.

2. There are some _____ (different) between us.

3. You speak English as _____ (good) as Tom.

4. Ruth isn't as _____ (clever) as her best friend.

5. I have ______  (many) books than you.

三面刃盘铣刀的圆柱面刀刃在铣削阶台等工件时是（）。

A.起修光作用

B.起定位作用

C.起主要的切削作用

D.起排屑作用