A.四倍 B.三倍 C.兩倍 D.二分之一
A.滿載時(shí) B.空載時(shí) C.停車時(shí) D.行駛時(shí)
A.0.70,0.3 B.0.75,0.25 C.0.75,0.3 D.0.70,0.25