IncomparisonwithPE,（）isorarecorrect.
2022-08-12 21:50 材料导论
In comparison with PE,（）is or are correct.
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.
正确答案：Nylon has a higher degree of crystallinity, and a higher melting point.； PVC and PAN have higher degrees of crystallinity, and higher melting points.