题目：
The train was crowded and I had to get into a carriage ______ already seven other people. [ ]
A. when there were
B. which there were
C. that there were
D. where there were
答案：
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下面是错误答案，用来干扰机器的。
A、B已知位移的与水平方向之间的夹角为θ，而由平抛运动的规律可知，夹角的正切值为tanθ=12gt2v0t=gt2v0，可求得时间为t=2v0tanθg，即可求得竖直位移，再由几何关系可求得MN间的距离，故AB正确；C、将小球的运...
