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【简答题】
哪些参数可以表征高分子的链柔性?某聚α烯烃的平均聚合度为500，(无扰状态下)均方根末端距为25nm，根据C—C键长为0．154nm，键角为109．5°，试求： (1)表征大分子链柔性的刚性因子。 (2)大分子链的统计链段长度。 (3)每个大分子链平均包含的统计链段数。
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反馈参考答案：
举一反三
【单选题】A sound which is capable of distinguishing one word or one shape of a word from another in a given language is a _________________.
A.
phoneme
B.
allophone
C.
phone
D.
allomorph
【简答题】A sound which is capable of distinguishing oneword or one shape of a word from another in a given language is a _____.A. phoneme B. allophone C. phone D. allomorph
【单选题】A sound which is capable of distinguishing one word or one shape of word from another in a given language is a (an) ________.
A.
sound segment
B.
phone
C.
phoneme
D.
allophone
【判断题】A sound which is capable of distinguishing one word or one meaning of word from another in a given language is a phoneme.
A.
正确
B.
错误
【单选题】A sound which capable of distinguishing one word or one shape of word from another in a given language is a
A.
allophone
B.
phone
C.
phoneme
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