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
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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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