【单选题】How long did St. Patrick study Christianity?
【简答题】Some people will be at a loss in case of a fire.
【单选题】What should we do in case of a fire?
A.
Get out of the house with the valuables.
B.
Water can be used to extinguish an electrical fire.
C.
If your clothes are on fire , run as fast as you can.
D.
If smoke, heat or flames block your exit routes, stay in the room with doors closed.
【单选题】This fire extinguisher is to be used only in case of ___________.
【判断题】CBR试验需绘制单位压力p与贯入量l关系曲线。
【单选题】An emergency _______ is very important in case of fire.
【单选题】绘制CBR单位压力(P)与贯入量(L)的关系曲线,出现凹曲时应()。