Effective research and surveillance programmes are needed to detect types, frequency and clinical Settings of such events.

需要有效的研究和监测规划以查明这类事件的类型、发生频率和临床环境。

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To determine the frequency and nature of childhood injuries and to explore the risk factors for such injuries in low-income countries by using emergency department (ED) surveillance data.

利用急诊室的监测数据确定低收入国家儿童受伤的频率和性质，并探讨造成此类伤害的风险因素。

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A digital video frequency surveillance system is designed and implemented. The system is consisted of video frequency server based on embedded pl ATform, PC-based control center and client.

设计和实现了一个嵌入式视频监控系统，系统由基于嵌入式平台的视频服务器、基于PC机的控制中心和客户端组成。

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Products include respirators, surveillance equipment, radio frequency identification equipment, insulation, weatherproofing materials, cleaning products, mats, and granules for asphalt shingles.

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