When must a dry chemical fire extingui

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

2、An ABC dry chemical fire extinguisher

An ABC dry chemical fire extinguisher would be least effective against a fire in（）.Aa mattressBspilled liquids such as oil or paintChigh voltage electrical gearDa trash ca

3、Dry chemical fire extinguishers are ef

Dry chemical fire extinguishers are effective on which type(s) of fire?（）ABurning oilBElectricalCPaintDAll of the above

4、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

5、An advantage of a dry chemical over a

An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）.Agreater rangeBeffectiveness on all types of firesCcleanlinessDAll of the above

6、Each fire pump on a tanker must have a

Each fire pump on a tanker must have a pressure gauge located at（）.Athe pump dischargeBthe manifold connectionCeach fire station dischargeDthe pump statio