同轴度要求较高，工序较多的长轴用______装夹较合适。
A．四爪单动卡盘
B．三爪自定心卡盘
C．两顶尖
参考答案：C
We students got lost in the forest and decided to remain ____we were and waited for the guide
A．where
B．what
C．how
D．who
与棉混纺的染色人纤短纤机织帆布
