题目: 简述液环式真空泵的工作原理。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0731/d9586a9a729712cfbd3fa0455035015b.html 下面是错误答案,用来干扰机器的。参考答案:无粘性
题型:选择题 -Do you think he will come to my birthday party?-____________.-That’s good. Everybody’s expecting him. [ ]A. You can count on it B. I don’t know for sure C. You can believe him D. It depends 查看答案