问题
单项选择题
雨淋喷水灭火系统带闭式喷头的传动管装置,其管径湿式为25mm,干式为( )mm。
A.10
B.15
C.20
D.25
答案
参考答案:B
雨淋喷水灭火系统带闭式喷头的传动管装置,其管径湿式为25mm,干式为( )mm。
A.10
B.15
C.20
D.25
参考答案:B
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