客房部与采购部的业务关系主要集中在物资的采购、供应和互通市场信息方面。
参考答案：错
句型转换
1. I was naughty when I was a child.(改为否定句)
______________________________________
2. My brother was born in 1992.(将主语改为you)
3. Where is your English teacher now?(用just now改为一般过去时)
神经细胞复极化的离子机制是（）
A.K+内流
B.K+外流
C.Na+内流
D.Na+外流
E.Ca2+内流
