抛光丝带棉有（）号和1号两种规格。
A.0
B.2
C.3
D.8
参考答案：A
— Is Peter there?
— ______, please. I'll see if I can find him for you. [ ]
A. Hold up
B. Hold on
C. Hold out
D. Hold off
精刨代刮应采用较大的切削速度和切削深度.
