Observe that system a sends a small data packet to system b, and waits for a response packet before granting or denying the login request.
可以看到系统A向系统b发送了一个小数据包，然后等待响应包，已决定同意或拒绝登录请求。
Objective To observe the clinic effect of lamivudine in children with chronic hepatitis B and its influence of HBV markers.
目的观察拉米夫定治疗儿童慢性乙型肝炎的临床疗效及对乙肝病毒标志物的影响。
Objective To observe B-scan ultrasonographic features of eyes with silicone oil tamponade after retinal reattachment surgery.
目的观察视网膜脱离复位手术后硅油填充眼的B型超声声像图特征。
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