单项选择题
A.salt water B.foam C.low-velocity fog D.CO2
A.cooling the outside bulkheads with water B.shutting all sources of air into the compartment C.closing the sea chest D.flooding the compartment with salt water
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