题目聚羧酸系高性能减水剂的减水率一般为()。A. 25-30%B. 20-30%C. 20-35%D. 30-35%聚羧酸系高性能减水剂的减水率一般为()。A. 25-30%B. 20-30%C. 20-35%D. 30-35%题目解答答案A. 25-30%