目的 观察新月形面枕和U形床垫在视网膜脱离眼内填充术后俯卧位患者的应用效果.方法 88例视网膜脱离硅油眼内填充术后患者随机分为......

The performance of a cellular location system based on received signal strength difference (RSSD) is investigated. In th......