使用活性骨料，用户要求提供低碱水泥时，水泥的碱含量应小于水泥用量的0.6%或由供需双方商定。
参考答案：对
Could you tell me __________?[ ]
A. where do you live
B. who you are waiting for
C. who were you waiting for
D. where you live in
高速线材轧机的精轧机采用直径较小的辊环，就是为了（）轧制压力。
A、增大
B、减小
C、不变
