空间利用率高，适合体积较大、包装质地坚硬的商品的垛形是串联式。
参考答案：错
With the fresh water________short,we human beings are facing the danger of dying from thirst at
any time.[ ]
A. to run
B. to be run
C. running
D. run
a÷b=9…5，如果a和b都乘100，那么商是______，余数是______．
