大型矿车所使用的悬挂大部分为（）所组成的悬挂。
A.钢板弹簧
B.空气弹簧
C.油气弹簧
D.橡胶弹簧
参考答案：C
His parents’______ was that the room should be cleaned up after the party. [ ]
A. saying
B. request
C. command
D. words
怎么计算泄漏点？
