Which one (s) of the following is or are correct?

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A.Isotactic and syndiotactic polymers possess stereo-regular structures

B.Atactic and isotactic polymers possess stereo-regular structures

C.Isotactic and syndiotactic polymers are rigid, crystallizable, high melting, and relatively insoluble

D.Atactic polymers are rigid, crystallizable, high melting, and relatively insoluble

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答案：Isotactic and syndiotactic polymers possess stereo-regular structures；Isotactic and syndiotactic polymers are rigid, crystallizable, high melting, and relatively insoluble

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