水平网络
参考答案：是指那些在仓库结构方面处于同一层面的所有仓库。
高聚物的粘性流动的特点？
—Do you watch sports every day?
—No, I don’t. ______ I play ping-pong ______ tennis every day. So I can play them well.[ ]
A. But, or
B. And, but
C. But, and
D. And, or
