5.12 Why didn't the alarm sound?

5.12 The reasons why the alarm is sounded without sound are as follows:

1. The alarm is damaged: there may be bad weather the day before or the day before, and the wind and rain may cause the alarm to be damaged, resulting in no sound.

2. untimely maintenance: road construction or other reasons may cause the alarm to fail, and the failure of maintenance personnel to timely repair may cause the alarm to be silent.

3. System failure: Because the disaster prevention and warning system has complicated relations with systems in other places, such as the power system, the system failure in one place may affect the whole system operation in all other places.