单选题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
单选题
A fire main system must have enough fire hydrants so that each accessible space may be sprayed with（）.
A
a low velocity spray applicator
B
a water spray or solid stream
C
at least two spray patterns of water
D
at least 25 psi delivered pressure
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