从液力变矩器流出的自动变速器液流入（）。
参考答案：冷却器
爱因斯坦曾上书美国总统罗斯福建议制造原子弹
How often have you queued for （） seems like hours at the booking office before you can get a train ticket
A. what
B. which
C. that
D. when
