In comparison with PE,（）is or are correct.

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A.Nylon has a higher degree of crystallinity, and a higher melting point.

B.Nylon has a higher degree of crystallinity, and a lower melting point.

C.PVC and PAN have higher degrees of crystallinity, and higher melting points.

D.PVC and PAN have lower degrees of crystallinity, and lower melting points.

参考答案:

答案：Nylon has a higher degree of crystallinity, and a higher melting point.； PVC and PAN have higher degrees of crystallinity, and higher melting points.

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In comparison with PE,（）is or are correct.

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In comparison with PE,（）is or are correct.

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