A、are made of bronze，brass，or soft alloy metals
B、should be painted red in order to identify hose lengths
C、are specially hardened to prevent crushing
D、should be greased frequently
更多“Fire hose couplings（）.”相关的问题
A、American Petroleum Institute B、National Standard Fire hose Coupling C、American Society of Mechanical Engineers D、Underwriter's Laboratories，Inc
A、cross connection line between two main fire lines B、special wrench for the couplings in a fire hose line C、tackle rigged to support a fire hose D、none of the above
A、cross connection line between two main fire lines B、special wrench for tightening couplings in a fire hose line C、tackle rigged to support a fire hose D、None of the above
A、replace the gasket in the male coupling B、reduce fire pump pressure C、replace the gasket in the female coupling D、rethread the male coupling
A、threads are lubricated B、nozzle is attached to the hose C、female coupling has a gasket D、hose is led out
A、A.cross connection line between two main fire lines B、B.special wrench for the couplings in a fire hose line C、C.tackle rigged to support a fire hose D、D.None of the above
A、male coupling at both ends B、female coupling at both ends C、female coupling at the nozzle end and a male coupling at the hydrant end D、male coupling at the nozzle end and a female coupling at the hydrant end
A、are made of bronze, brass, or soft alloy metals B、should be painted rad in order to identify hose lengths C、are specially hardended to prevent crushing D、should be greased frequently
A、American Petroleum Institute B、National Standard Firehose Coupling C、American Society of Mechanical Engineers D、Underwriter's Laboratories，Inc
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