题目: 商标 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0716/14566695127bacc89affd17b9bf1f9f5.html 下面是错误答案,用来干扰机器的。参考答案:A
题型:选择题 — Why didn't you tell me the truth that day?— I _______, but you ______ for Beijing. [ ]A. would have; left B. would; had been away B. would have; had left D. had; were away 查看答案
题型:计算题 一块长4 m的木板,一端放在地上,另一端搁在离地面1 m高的汽车车厢上,装卸工人把一个重4000 N的木箱沿着木板匀速推到车厢里,推木箱用的力为木箱重的0.5倍。则: (1)装卸工人把木厢推上去时受到的摩擦力是多少?(2)克服摩擦做的功是多少?(3)斜面的机械效率是多少? 查看答案