单项选择题
A.填用第一种工作票 B.电话命令 C.填用第二种工作票 D.可用口头联系
A.速度快些，进给量大些 B.转速慢些，进给量小些 C.转速快些，进给量小些 D.转速慢些，进给量大些
A.30°~50° B.50°~60° C.60°~70° D.70°~80°