题目

--- The weather isn’t good enough for an outing, is it? ---Not in the least. We can’t have ______ at this time of the year. A. a worse day                B. a nice day          C. such a bad day          D. so fine day 答案：A37、质量为8t的卡车，在水平公路上匀速行驶时受到的摩擦阻力是车重的0.02倍，求卡车行驶时，发动机对卡车的牵引力是多大？