— _____________ is it?
— Thirty yuan. [ ]
A. How
B. How many
C. How much
D. How old
答案:C
定位数据
JD型调度绞车制动器的检修,要求闸皮不得断裂,闸带磨损的厚度不得大于()。
A、2mm
B、2.5mm
C、1.5mm
D、1mm