当防烟楼梯间与消防电梯合用前室井采用自然排烟时，可开启外窗的面积不应小于（）
A.3㎡
B.2㎡
C.前室面积的5％
D.前室面积的2％
参考答案：A
心理咨询范围不包括( )。
A．心因性疾病 B．行为障碍C．处于发作期的精神病患者 D．神经症
- What do you think the teachers in your school are like?
- I think they are very kind, _____ they look serious. [ ]
A. though
B. or
C. because
D. and
