——Jack , you look tired today. What’s wrong?——I was ____busy_______ I didn't go to bed until midnight yesterday.
车型
载货能力(箱/辆)
运费
甲村(元/辆)
乙村(元/辆)
大货车
70
800
900
小货车
35
400
600
使用弹簧测力计的注意事项,有关说法不正确的是( )