1.刀架安装好后,刀架丝杠(横丝杠)空程量不超过(  )转。 

1.刀架安装好后,刀架丝杠(横丝杠)空程量不超过(  )转。 

A.3/20

B.2/20

C.1/20

D.0.5/20

正确答案是C