热力系从某一状态开始,经过一系列中间状态后又恢复到原来的状态,这种()的过程叫做循环 发布时间:2017-07-25 21:33 │ 来源:www.tikuol.com 题型:单项选择题 问题: 热力系从某一状态开始,经过一系列中间状态后又恢复到原来的状态,这种()的过程叫做循环。A、封闭B、封堵C、封住D、敞开
题型:单项选择题 —They say Tom's brother is a billionaire. —_____________? He wouldn't accept any help from his brother, even though it was offered. [ ] A. What if B. What for C. So what D. Forget it 查看答案
题型:单项选择题 — _____.— It's a desk. [ ]A. What's that? B. That's all right. C. This is a desk. D. How are you? 查看答案