封闭避难层(间)的机械加压送风量应按避难层净面积每m2不小于()计算。
A.30m3/h
B.20m3/h
C.40m3/h
D.10m3/h
参考答案:A
I can''t tell the time because the ________of the clock have been removed.
A.hands
B.pointers
C.arms
D.fingers
痰厥癫痫者宜选的药物是()
A.雄黄
B.硫黄
C.白矾
D.樟脑
E.蟾酥