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介绍一种磁场测量装置。它可用于监测公路车流量，具有不受雨、雾等恶劣天气影响，只敏感车辆，不敏感过往人员、动物等特点。
A magnetic field measuring device is described. It can be used to monitor the flow of road traffic, with the characteristics of weather-resistant, sensitive vehicles, insensitive past people and animals.