单项选择题
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
If liquid freon should come in with your skin, you shou...
单项选择题If liquid freon should come in with your skin, you should （）
A.wash with salt water B.wash with sterile mineral oil C.treat it like frostbite D.treat it like any burn
