某工人用如图18所示滑轮组提升重物,工人用250N拉力将重为 400N的重物匀速 发布时间:2017-07-21 17:36 │ 来源:www.tikuol.com 题型:选择题 问题: 某工人用如图18所示滑轮组提升重物,工人用250N拉力将重为400N的重物匀速提升10m,请根据提供的信息,计算三个相关的物理量。
题型:选择题 The students gave a quick answer to the question ________they did it,________was raised by the foreign visitors.A.which;whichB.why;whichC.why;thatD.that;that 查看答案