加工余量较小工件的粗加工和半精工（）采用强力刨削。
A、能
B、不能
C、必须
参考答案：B
----Do you play football after work ?
---Yes, ________ ． Playing football is not my favorite sport．
A．more or less
B．once in a while
C．time and again
D．sooner or later
什么是丝光？丝光后棉性质有哪些变化？
