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【简答题】
关于病理反射的描述,下列哪项正确
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反馈参考答案：
举一反三
【单选题】While income worry is _______ rather common problem of the aged, loneliness is another problem that ________ aged parents may face.
A.
a; 不填
B.
the; 不填
C.
a; the
D.
the; the
【简答题】何谓聚合物液晶?聚合物液晶分为哪几类?
【单选题】While income worry is _______ rather common problem of the aged, loneliness is another problem that _______ aged parents may face.
A.
a; the
B.
the; /
C.
a; /
D.
the; the
【单选题】While income worry is ____ rather common problem of the aged,loneliness is another problem that ____aged parents may face.
A.
a;/
B.
the;/
C.
a;the
D.
the;the
【简答题】命名下列聚合物，并根据其主链结构指出它们属于碳链聚合物、杂链聚合物、还是元素有机聚合物?
【单选题】She was thinking over the problem again on her way home, when she found herself _______ in front of his company.
A.
standing
B.
stand
C.
stood
D.
to stand
【简答题】试指出下列结构的聚合物，其溶解过程各有何特征?(1)非晶态聚合物；(2)非极性晶态聚合物；(3)极性晶态聚合物；(4)低交联度的聚合物。
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