在铣床上用连续分齿断续展成飞刀铣削蜗轮,若刀头中径齿厚超差,会造成蜗轮()。
A.乱牙
B.齿形误差超差
C.齿厚不对
D.齿向误差超差
参考答案:C
I _use a clock to wake me up because at six o'clock each morning the train comes by my house. [ ]
A. couldn't
B. mustn't
C. shouldn't
D. needn't
以下哪些操作系统属于智能终端的操作系统?()
A.安卓操作系统
B.WindowsPhone
C.塞班S40
D.IOS