CRH1A外门紧急解锁时,()限位开关激活,使EDCU发出电气封锁信号。
A.EDS
B.DCS
C.LOS
D.DLS
参考答案:A
John returned with two workers, with_______ help we finally got the car out of the mud.
A.whose
B.their
C.which
D.that
因渗碳主轴工艺比较复杂,渗碳前,最好绘制()。
A、工艺草图
B、局部剖视图
C、局部放大图
D、零件图