【简答题】已知一开环控制数控车床伺服系统的步进电动机转子齿数为50,采用四相双四拍的通电控制方式,工作台运动的脉冲当量为0.005mm,机械系统的滚珠丝杠导程为6mm,则该机械系统减速器的总传动比为( )。
【单选题】My headache _________ me.I thought it was going away, but it’s getting worse and worse.
【单选题】My headache _____ me.I thought it was going away, but it is getting worse and worse.
【判断题】属人管辖权与普遍管辖权发生冲突时,后者优先。( )
【简答题】已知一开环控制数控车床伺服系统的步进电动机转子齿数为60,采用四相双四拍的通电控制方式,工作台运动的脉冲当量为0.005mm,机械系统的滚珠丝杠导程为6mm,则该机械系统减速器的总传动比为( )。
【简答题】My headache is killing me. I ______ it was going away. But now it’s getting worse and worse. A.think B.thought C.have thought D.had thought
【单选题】数控机床的传动系统比通用机床的传动系统( )。
【多选题】20世纪30年代,马克思主义史家同非马克思主义史家在关于中国社会性质和社会史方面论战的焦点是( )。
【单选题】My headache _____ me.I thought it was going away, but it’s getting worse and worse.