A fire must be ventilated（）.
1、Each fire hose coupling on a ship must
Each fire hose coupling on a ship must have threads that meet the specifications of the（）.AAmerican Petroleum InstituteBNational Standard Firehose CouplingCAmerican Society of Mechanical EngineersDUnderwriter's Laboratories，Inc
A system must be evaluated and tuned.  In order to use a set of performance...
3、A fire main system must have enough fi
A fire main system must have enough fire hydrants so that each accessible space may be sprayed with（）.Aa low velocity spray applicatorBa water spray or solid streamCat least two spray patterns of waterDat least 25 psi delivered pressure
4、The fire pumps must be capable of deli
The fire pumps must be capable of delivering a total quantity of water at a defined head, not less than _____ of the total bilge pumping capacity.Aone-thirdBtwo-thirdsCone-fourthDtwo-fourths
5、When should a fire be ventilated?（）
When should a fire be ventilated?（）AWhen attacking the fire directlyBWhen using a steam smothering systemCWhen using the fixed CO2 systemDAll of the above
6、When must a dry chemical fire extingui
When must a dry chemical fire extinguisher be recharged?（）AAfter each useBWhen the air temperature exceeds 90°FCEvery 6 monthsDEvery 12 month