汽车行驶系的主要功用之一是将传动系传来的转矩转化为汽车行驶的（）。
参考答案：驱动力
关于应力性骨折，正确的描述是（）
A.为青少年特有的骨折类型
B.可见明确的低密度骨折线
C.有明显成角畸形
D.第四跖骨
E.同一部位多次轻微外伤所致
— I went to have the driving test this morning, but I didn't pass it.
— _____ [ ]
A. Luck decides everything.
B. Better luck next time.
C. But you can drive well.
D. You are always unlucky.
