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List three examples of Vinyl polymers? What irregularity or configurational isomerisms can these polymers have? (anwer in English)

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Explain the terms of: Tacticity, isotactic, syndiotactic and atactic. (answer in English and Chinese)

How to measure the tacticity of polymers? List main methods/

1下面对于“全面提高学生的语文素养”理解正确的是（）

A
B
C
D

2.对于“语文素养”的理解，正确的是（）

A. 1
B. 2
C. 3
D. 4