计算392×67时,可以估计到积是一个______位数.
算式392×67,可以把392看作400,67看作70进行估算,即392×67≈28000;
故答案为:五.
What is the best way you can imagine _____ the overuse of water in our school? [ ]
A. reducing
B. to reduce
C. reduced
D. reduce
护木要铺满桥面,在钢梁活动端须()。