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加利福尼亚洲有3万人口的罗斯维尔市去年发生了一场具有毁灭性的洪水。一年以后,该市由于设置了一套由加洲森尼韦尔的汉达公司制造的ALERT型警报设施系统,因而基本做到能掌握天气变化情况。该ALERT系统由传感器和传送设备组成。由一位水
Last year there was a devastating flood last year in the city of Roseville, which has a population of 30,000 in California. A year later, the city was basically in control of the weather as a result of the installation of an ALERT-type alarm facility, manufactured by Handa, Inc. of Sunnyvale, California. The ALERT system consists of sensors and transmitters. By a water