题目内容
醇醛缩合就是在稀碱条件下,醇和醛的缩合反应。
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三氯乙醛与一般醛不同,可以与水形成稳定的水合氯醛。这是由于3个氯原子取代后强烈的诱导效应使羰基的活性大大增强的结果。
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三级真题实训1. It's important to realize how(quick)_______ this disease can spread over the globe. (2010-06)2. I tried to fix my computer myself, but that just made it (bad) ______ than I had expected. (2011-06)3. In order to improve your communication skills, we will show you how to learn _____ about your customers than you know now. (2011-12)A. many B. much C. most D. more4.If you want to be (success)__________in life, you should be honest and self-confident. (2011-12）5. Those who get nervous (easy)______may try Taiji ,which relaxes the mind and strengthens the body. (2012-06)6. Many people find telephone interviews (difficult) _____________ than face-to-face interviews.(2012-12)7.We hope to bring together all the parties (direct)________ involved in the conflict. (2013-06）8. Sales in the first half of the year were (slow)_______than expected, but they are expecting stronger sales in the second half. (2013-12)9. (obvious)__________ the company does not seem to care much about its customer services. (2013-12)10. Your prices were (reasonable)_________________ than those of the other two companies.(2014-06)
在下列哪些工作中需要用到装配图
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