— What is Jenny doing?
— She is ____________.[ ]
A. swims
B. swimming
C. swim
答案:B
已定义char ch="$";int i=1,j;执行j=! ch&&i++以后,i的值为______。
定位点不足而不能满足加工精度要求的定位,称欠定位。定位时,应防止产生欠定位。( )