偏心辊子整形器安装后用手转动各辊子是否灵活,上下滑动辊子,其窜动量不得大于()。
A.0.1mm
B.0.5mm
C.lmm
D.1.5mm
参考答案:C
I used to be able to play well but I'm _____ now.
A.out of date
B.out of touch
C.out of practice
D.out of place
表面处理的对象可分为两大类:()和()。