题目数控机床主轴以600转/分转速正转时,其指令应是()。A. M06 S600B. M04 S600C. M03 S600D. M05 S600数控机床主轴以600转/分转速正转时,其指令应是()。A. M06 S600B. M04 S600C. M03 S600D. M05 S600题目解答答案C. M03 S600