The problem of burglar alarm

The main problems faced by home burglar alarms are the following: 1. The magnetic detector is relatively safe, because its alarm signal is generated after the doors and windows are pushed by the external force. If there is no committing action then it will not produce an alarm trigger signal. Howe

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Can China "support" 200 million cars?

Wang Fuchang, deputy director of the Department of Equipment Industry of the Ministry of Industry and Information Technology, pointed out on September 5 that it is expected that the number of vehicles in China will exceed 200 million by 2020, and the resulting energy security and environme

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