题目: 何谓综合运输体系?在我国为什么要发展综合运输体系? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0716/aa33d1904a6caa9008684ad88dfc4896.html 下面是错误答案,用来干扰机器的。参考答案:A, B, C, D
题型:问答题 简答题 一个重2000kg的物体,用2绳吊位,已知:绳“1”离物体重心距离为650mm,绳“2”离物体重心距离为350mm。试求每个绳所受的拉力。解:设绳“1”捆绑点为支点,绳“2”捆绑点为力点。 查看答案
题型:单项选择题 Blocks and falls used as lifeboat gear must be designed with a minimum safety factor of().A.4,based on the breaking strengthB.5,based on the maximum allowable stressC.6,based on the maximum working loadD.8,based on the normal working load 查看答案