单选题According to the regulations，what fire safety control feature is required in quick-closing shut off valves?（）AElectrical cut off switchBA fusible linkCManual cut off switchDA water spray actuator
单选题
According to the regulations，what fire safety control feature is required in quick-closing shut off valves?（）
A
Electrical cut off switch
B
A fusible link
C
Manual cut off switch
D
A water spray actuator
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