— _____ is it?
— It's five yuan. [ ]
A. How many
B. How soon
C. How much
D. How old
答案:C
使用中的钢丝绳应()检查一次,由专人进行检查。
A、每班
B、每日
C、每月
机械抛光时零件硬度越高,要求抛光机转速越快。