1)manual fire alarm,手动火灾报警2)hand fire alarm,手动火灾报警器3)manual fire alarm box,手动火灾报警箱4)manual fire alarm call point,手动火灾报警点5)manual fire alarm sounder,手动火灾警报器6)manual fire alarm button,火灾手动报警按钮
用法和例句
The manual fire alarm buttons are an important part of a fire alarm system;particularly in petrochemical plant area,it is even a major device of fire alarm at site.