题型:问答题 —Tomorrow is Sunday. Are you going swimming? —I’m not sure. It _______ the weather. [ ]A. looks like B. waits for C. depends on D. looks after 查看答案
题型:问答题 一个体重为65Kg的高空跳伞运动员,从飞机上跳下。(g取10N/Kg) (1)打开降落伞前,运动员受到的合力多大?方向如何?(不计空气阻力) (2)打开降落伞后,某时刻受到竖直向上的空气阻力f = 1000N,此时运动员受到的合力大小、方向如何? 查看答案