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【单选题】
下列关于聚羧酸减水剂说法错误的是（ ）A.
聚羧酸减水剂分子结构为梳型；
B.
聚羧酸减水剂的空间位阻效应较弱；
C.
聚羧酸减水剂具有低掺量高性能的特点；
D.
聚羧酸减水剂合成时不使用甲醛。
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