单项选择题
A.泡沫消火栓 B.水型消火栓 C.干粉消火栓 D.二氧化碳消火栓
A.30s B.60s C.90s D.120s
A.60~120mm B.70~130mm C..80~200mm D.75~150mm
A.10m B.12m C.5m D.8m
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