钢丝绳在绕过卷筒和滑轮时主要受拉仲、弯曲、挤压、摩擦力。()A、正确 B、错误 发布时间:2017-07-03 12:54 │ 来源:www.tikuol.com 题型:单项选择题 问题: 钢丝绳在绕过卷筒和滑轮时主要受拉仲、弯曲、挤压、摩擦力。()A、正确B、错误
题型:单项选择题 —What do her parents do?—Her parents _________ English teachers.[ ]A. are allB. all areC. are bothD. both are 查看答案