（）不是用动力源进行驱动的阀门。
A.液动阀
B.气动阀
C.电动阀
D.减压阀
参考答案：D
可不设灯光疏散指示标志的是( )。
A．人防工程的疏散走道及其交叉口
B．2类居住建筑外的高层民用建筑的疏散走道和安全山口处
C．影剧院的疏散走道
D．医院病房的疏散门
Directions: Write an essay of 160～200 words based on the following drawings. In your essay, you should:
1) describe the drawing briefly;
2) interpret the phenomenon reflected by it, and then
3) give your comments.
You should write neatly on ANSWER SHEET 2.
