牙挺的工作原理有:杠杆原理、楔的原理、轮轴原理。 发布时间:2017-02-06 19:21 │ 来源:www.tikuol.com 题型:判断题 问题: 牙挺的工作原理有:杠杆原理、楔的原理、轮轴原理。
题型:判断题 The weather was hot, so we _______ have a swim at the pool. [ ]A. made B. felt C. enjoyed D. decided 查看答案