单项选择题
A.conduct a fire drill B.conduct a boat drill C.log the fore and aft draft marks D.test the emergency generator
Portable foam type fire extinguishers are most effectiv...
单项选择题Portable foam type fire extinguishers are most effective on（）.
A.mattress fires B.oil fires C.wood fires D.All of the above
Portable fire extinguishers must be provided for the ca...
单项选择题Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.
A.only when fully loaded B.if one or more tanks are full C.when transferring cargo D.only when the barge is being towed
Portable CO2 fire extinguishers should NOT be used to i...
单项选择题Portable CO2 fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of（）.
A.the CO2 being inhaled by personnel B.reflash of burning liquids C.vapor condensation on the extinguisher D.the discharge causing a static spark
