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【判断题】
对羟基苯甲酸乙酯也叫酯。A.
正确
B.
错误
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举一反三
【简答题】RST 复位信号输入端,_________(填写高电平或低电平)有效,此引脚加上持续时间大于 _________ 个机器周期( 24 个时钟振荡周期)的高电平时,就可以完成复位操作。
【单选题】News report 1--- 1. What did the study find about the effect of having more job authority? [音频]
A.
It increases symptoms of depression in men.
B.
It increases symptoms of depression in women.
C.
It decreases symptoms of depression in both men and women.
D.
It increases symptoms of depression in both men and women.
【简答题】听下面一段材料，回答第1至第2题。 1. What did the man promise the woman to do? [ ] A. To help her study for the exams. B. To help her learn Japanese. C. To help her go to Japan. 2. Why does the man go to Japan? [...
【简答题】How did ancient people discover medicines from nature? 2. What is the pharmaceutical record “ Papyrus Ebers ” involved in? 3. What do medical texts first record in Ancient Babylonia? 4. What did Shen ...
【多选题】关于自由基聚合反应速率说法正确的有：
A.
在单体中，如果有阻聚剂存在，则引发剂分解产生的初级自由基无法引发单体聚合，无聚合物生成，聚合速率为零
B.
当单体转化率提高，体系粘度增大，体系会出现自加速现象
C.
自加速现象主要是链自由基的活性中心被包埋，无法双基终止，同时链自由基还可以继续捕捉单体反应，总体而言聚合速率提高
D.
不加溶剂的本体聚合，自加速现象不明显，反应速率较好控制
E.
自动加速现象在自由基聚合反应中是一种普遍存在的现象
【单选题】[音频] News report 1--- 1. What did the study find about the effect of having more job authority?
A.
It increases symptoms of depression in men.
B.
It increases symptoms of depression in women.
C.
It decreases symptoms of depression in both men and women.
D.
It increases symptoms of depression in both men and women.
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