高层建筑消防楼梯必须设有什么设施?
参考答案:
防排烟设施。
—Do you like green vegetables?
—______.[ ]
A. Yes, I am
B. No, I do
C. Yes, I do
D. No, I'm not
The runner in the middle of the race.
A.gave in
B.gave up
C.gives off
D.gave out