【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in...
【单选题】Firefighters are often asked to speak to school and community groups about the importance of fire safety,particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in...
A.
on a ceiling,between four and twelve inches from a wall.