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【多选题】
社会主义市场经济的基本特征主要体现在A.
所有制结构
B.
分配制度
C.
宏观调控
D.
政策指导等方面
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【单选题】Which is NOT correct about business letter?
A.
There are certain rules you have to follow when drafting a business letter.
B.
Inquiry, recommendation or application letter all belong to the category of business letter.
C.
We write a business letter when we need to buy or sell something.
D.
A business letter is an official correspondence between two or more parties.
【单选题】Which is NOT correct about business letter?
A.
Inquiry, recommendation or application letter all belong to the category of business letter.
B.
A business letter is an official correspondence between two or more parties.
C.
We write a business letter when we need to buy or sell something.
D.
There are certain rules you have to follow when drafting a business letter.
【多选题】Which of the following are correct concerning personal letter?
A.
A personal letter is an informal letter.
B.
A personal letter is also known as “private letter” or “friendly letter”.
C.
A personal letter serves as a way of communication between people who are usually well acquainted.
D.
A personal letter usually consists of topics on a personal level.
【简答题】．[实验化学] 苯亚甲基苯乙酮俗称查尔酮，淡黄色棱状晶体，熔点58℃，沸点208℃（3.3kPa）易溶于醚、氯仿和苯，微溶于醇。制备原理如下： (查尔酮) （1）制备过程中，需在搅拌下滴加苯甲醛，并控制滴加速度使反应温度维持在25～30℃，说明该反应是 （填放热或吸热）反应。如温度过高时，则可以采取 措施。 （2）产品结晶前，可以加入几粒成品的查尔酮，其作用是 。 （3）结晶完全后，需抽滤收集产物...
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