This paper analyzes the cause of false signallings that result in abnormal ex-change disconnection, abnormal user off - hook, some ways against them is showed.

对引起交换机非正常拆线、用户非正常挂机的伪信今的产生原因作了初步分析，并针对这些原因提出了改进的措施；

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Considering MRA as the standard, the sensibility of diagnosing abnormal vessels by TCD was 78.10%, specificity 94.22%, false positive 7.46%, false negative 23.31%, and the coincidence rate 89.36%.

以磁共振血管成像为标准，比较经颅多普勒超声发现相应血管病变数，得出诊断异常血管的特异性为94.22%、敏感性为78.10%、假阳性为7.46%，假阴性为23.31%及符合率为89.36%。

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Objective To determine the sensitivity and false-positive rate of maternal serum pregnancy associated plasma protein a (PAPP-A) screening for abnormal fetal karyotype.

目的分析妊娠相关血浆蛋白a (PAPP - A)在产前筛查胎儿染色体病时的灵敏度和假阳性。

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