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【单选题】
α- 醇酸加热脱水生成A.
α,β- 不饱和酸
B.
交酯
C.
内酯
D.
酮酸
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举一反三
【单选题】The use of analogy in Paragragh 2 is intended to_________.
A.
show how the negative feedback mechanism works.
B.
illustrate how the positive feedback mechanism protects the eyes.
C.
show how the eyes work.
D.
illustrate how the eyes are damaged by the light.
【简答题】22 A.It makes use of the Internet. B.It keeps personal records. C.It gives detailed feedback. D.It changes in accordance with the users.
【单选题】Loft Industries sells roof trusses to contractors and builders and is currently looking for honest feedback on its services. However, in the past, most of its efforts to procure feedback from customer...
A.
online focus groups
B.
telephone interviews
C.
mail questionnaires
D.
personal interviews
【多选题】戊戌维新运动的失败,主要是由于维新派自身的局限和强大的守旧势力的反对。其中,局限性主要表现为
A.
不敢否定封建主义
B.
对帝国主义抱有幻想
C.
缺乏群众基础
D.
没有顺应时代的改革纲领
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