备用报警器的英文

• spare alarm

• 备用:    reserve; spare; alternate; b ...
• 报警器:    annunciator; alarm; siren; w ...
• 专用报警器:    special alarm
• 报警器:    a unciator; alarm annunciator; alarm apparatus; alarm bell; alarm buzzer; alarm equipment; alarm rattler; alarm unit; alertor; alm alarm; announciator; horn; telltale; warner; warning howler
• 备用报务室:    spare radio room