【简答题】A是化学实验室中常见的有机物,它易溶于水并有特殊香味;B的产量可衡量一个国家石油化工发展的水平.有关物质的转化关系如图所示: (1)写出B的结构简式______; (2)写出下列反应的化学方程式 反应①:______ 反应④:______ (3)实验室利用反应③制取C,常用右图装置: ①a试管中的主要化学反应的化学方程式为______,反应类型是______. ②在实验中球形干燥管除起冷凝作用外,...
【单选题】听力原文:M: I'd like to buy some chairs for my new office. I wonder if you have some armchairs? W: Yes, sir. We have a great variety. I am sure you can find what you like. Q: Where does the conversation m...
【单选题】数据是机器学习的基础。每条数据记录(样本)在某个方面的表现或性质称为(),基于它进行样本表示。
【简答题】A是化学实验室中常见的有机物,它易溶于水并有特殊香味;B的产量可衡量一个国家石油化工发展的水平.有关物质的转化关系如图所示: (1)A中含有的官能团是______;B的结构简式是______; D的结构简式是______; (2)写出下列反应的化学方程式 反应①:______; 反应②:______ 反应类型是______. (3)实验室利用反应③制取C,常用如图装置: ①a试管中浓H 2 SO ...
【判断题】incentive market provides incentives, such as redeemable points or coupons for customers for making purchases from associated retailers.()
【简答题】________ in the office had made a mistake, and the firm regretted causing the customer inconvenience. A) Some B) Anyone C) One D) Someone
【单选题】_____ my new office when you are in town.
【单选题】I ( ) this e-mail to tell you about my new office.
【单选题】1 三苯胺 2 N- 甲基苯胺 3 对 - 硝基苯胺 4 苯胺按碱性递减排列顺序是 ( )