机车在停车时要移动而又无司机操纵时，只要拉动设在蓄能制动器上的（）就可进行缓解。
参考答案：手动拉环
As John Lennon once said，life is_____ happens to you while you are busy making other plans.
A．which
B．that
C．what
D．where
传递函数
