单项选择题
A.water B.dry chemical C.foam D.CO2
Which types of portable extinguisher should you watch f...
单项选择题Which types of portable extinguisher should you watch for the reflash of the fire?（）
A.foam and water B.CO2 and dry chemical C.dry chemical and water D.foam and CO2
A portable foam fire extinguisher is placed in operatio...
单项选择题A portable foam fire extinguisher is placed in operation by（）
A.turning it upside down B.pressing the foam lever C.squeezing the grip handle D.opening the hose valve
Before you begin administering artificial respiration, ...
单项选择题Before you begin administering artificial respiration, you should be sure the victim（）
A.is comfortable B.is warm C.is not bleeding D.has a clear airway
