平巷运输摘挂钩时必须在车辆（）操作。 A.运行时 B.停稳后 C.顶车中 发布时间：2018-01-29 13:10 │ 来源：www.tikuol.com 题型：单项选择题 问题： 平巷运输摘挂钩时必须在车辆（）操作。A.运行时B.停稳后C.顶车中
题型：单项选择题 用S、O、H、Mg各写出下列物质中的一种，并完成下列反应方程式．（1）单质______；氧化物______；酸______；碱______；（2）用以上所写物质完成下列方程式：单质与酸的反应______；氧化物与酸的应______；酸和碱的反应______． 查看答案
题型：单项选择题 从对话后的选项中选择适当的选项补全对话，把相应的字母番号填在方框下面的横线上。 (Doctor=D, Woman=W) D: Good morning. What's your trouble? W: I don't feel very well.D: 1______W: Yes, I have. My temperature is a little higher. D: Open your mouth and say,"Ah". W: Aahh. D: 2______W: Ever since last night. D: Did you sleep well? W: No. I was very tired last night. D: Oh, I see. 3______W: Can you tell me how I got a cold? D: Maybe you are too tired. W: I think so. I have too much work to do every day. Do I have to stay at home? D: Yes. You'd better stay at home for two or three days. W: 4______D: No, I don't think so. But you really need a good rest and take the medicine. W: 5______D: Three times a day. W: OK. Thank you. A.You've got a cold. B. How often do I have to take it? C. Have you taken your temperature? D. How long have you been like this? E. Is it serious? 查看答案
题型：单项选择题 （8分）CO，CH4均为常见的可燃气体。（1）等体积的CO，CH4在相同的条件下分别完全燃烧，转移的电子数之比为 。（2）120℃，101kPa下，a mL由CO，CH4组成的混合气体在b mL氧气中完全燃烧后，恢复至原来的温度与压强。①若混合气体与氧气恰好完全反应，产生b mLCO2，则混合气体中CH4的体积分数为多少？②若燃烧后气体体积缩小了a/4 mL，求a与b关系的数学表达式。 查看答案