能有效隔断风流的一组通风设施是（）。
A.风门、风桥
B.风门、风障
C·风门、风墙
D.风桥、风障
参考答案：C
I wonder why Jenny to us recently. We should have heard from her by now. [ ]
A. hasn't written
B. doesn't write
C. won't write
D. hadn't written
肾上腺素可激动的受体是（）
A.α受体
B.M受体
C.β受体
D.N受体
E.DA受体
