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【单选题】
4-1.已知一对单体进行共聚合时获得了恒比共聚物,其条件必定是 ( )A.
r1＝1.5,r2＝1.5
B.
r1＝1,r2＝1
C.
r1＝0.5,r2＝0.5
D.
r1＝1.5,r2＝0.7
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D.
was in hospital
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A.
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B.
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C.
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A.
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D.
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