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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

时间：2022-01-03 01:30 关键词： 燃烧与爆炸

答案解析

C