题目

--- What do you think of the film Avatar? --- It's fantastic. The only pity is that I _______ the beginning of it.A．missedB．was missingC．missD．will miss 答案：A解析:略水平传送带以v=2m/s速度匀速运动，将物体轻放在传送带的A端，它运动到传送带另一端B所需时间为11s，物体和传送带间的动摩擦因数μ=0.1，求：【小题1】传送带AB两端间的距离？【小题2】若想使物体以最短时间到达B端，则传送带的速度大小至少调为多少？（g=10m/s2）