分析了比幅鉴别器在导引头测向系统中的缺点，提出了用数字式自动增益补偿的方法来加以改善。
This paper describes the defect of amplitude-comparison discriminator in direction-finding system in PRS, then put forward a compensating method of digital automatic gain control.
目的观察在窄qrs波心动过速鉴别诊断时，头胸导联心电图是否优于常规12导联心电图。
Objective To observe whether the head-chest leads electrocardiogram (HCECG) is better than the routine 12-leads electrocardiogram (RLECG) in different diagnosis of narrow QRS complex tachycardias.
目的：总结分析胰头肿块型慢性胰腺炎和胰头癌的诊断与鉴别。
Objective: To analyze the diagnosis and differential diagnosis between chronic pancreatitis with mass in head of pancreas and cancer of head of pancreas.
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