A.avoid kinking the hose B.avoid personal injury during connection C.make connecting easier D.prevent spray on electrical equipment
A.preventing oxygen from reaching the burning material B.cooling the burning material below its ignition temperature C.using the extinguishing agent to make the burning material fire-resistant D.using the extinguishing agent to absorb the heat
A.Fire a red flare at night or a red smoke signal by day B.Send the Morse signal N by flashing light C.Make a round turn (360°) and resume course D.Make an S turn (hard right then hard left) and resume course
A.Point the horn down B.Turn cylinder upside-down C.Break the rupture disc D.Pull pin，squeeze grip
A.proceed with fueling operation B.have helicopter move to a safer location C.wash spilled fuel away with a flood of water D.clean spilled fuel with rags
