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【多选题】
为得到高分子量的逐步缩合聚合物,下列说法正确的是()A.
反应过程中，一定要前期 低压，后期减压
B.
只能选择高活性的单体
C.
等物质量投料，并避免单官能团杂质
D.
尽可能高的反应程度
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B.
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Shopping online.
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A.
Cooking methods
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Shopping online
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