问题
单项选择题
用乙酰丙酮分光光度法测定空气中的环氧氯丙烷时，显色反应在室温下进行缓慢，显色需（）h，若在100℃加热2～3min，反应即可完全，并且颜色能稳定（）h。
A.2，4
B.1，2
C.4，2
答案
参考答案：A
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用乙酰丙酮分光光度法测定空气中的环氧氯丙烷时，显色反应在室温下进行缓慢，显色需（）h，若在100℃加热2～3min，反应即可完全，并且颜色能稳定（）h。
A.2，4
B.1，2
C.4，2
参考答案：A
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| Do you like tea? Tea 1 becoming the most popular drink all over the world. In China, when you visit someone, the host will bring you a cup of good tea to show welcome. Americans love coffee and they like 2 , too. Not only Chinese, but also many people around the world like tea. The 3 people to drink tea were Chinese. And people in Europe first learned to grow and drink tea 4 a book in Italy in 1599.Fifty years later, the first ship of tea from China 5 Holland(荷兰). 1. 2. 3. 4. 5. |