减速顶由什么组成？
参考答案：
吸能帽和壳体外壳、活塞组合件、密封组合件和止冲装置等部分组成
从3双完全相同的鞋中，随机抽取一双鞋的概率是（）。
A．
B．
C．
D．
The mountain wind _____ as much as three inches of snow overnight.
A．took out
B．took over
C．took from
D．took off
