Structurally, most polymeric materials are crystalline, but some consist of mixture of crystalline and noncrystalline regions.
A.正确
B.错误
正确答案：错误
Structurally, most polymeric materials are crystalline, but some consist of mixture of crystalline and noncrystalline regions.
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We can consider the properties of a material in two categroies—chemical and physical.
Many of the common characteristics of material within a category araise from the lowest level of the structure, the nature of th
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