一项筛检试验,其灵敏度为80%,特异度为90%,将其用于患病率为1‰的人群中进行筛查 发布时间:2017-04-14 22:43 │ 来源:www.tikuol.com 题型:单项选择题 问题: 一项筛检试验,其灵敏度为80%,特异度为90%,将其用于患病率为1‰的人群中进行筛查。该试验的阳性预测值为()。A.0.79%B.10%C.20%D.70%E.99.98%
题型:单项选择题 先阅读,再判断。(对的写“T”,错的写“F”。) There is a farm near our school. John and I go to the farm today. There are many cows and sheep there. The cows are white and black. The sheep are white. We like them very much.( )1. Our school is near the farm.( )2. Amy and I go to the farm.( )3. We shear the sheep there.( )4. The cows are white and black.( )5. We like cows and sheep. 查看答案
题型:单项选择题 下述哪种情况会导致”LOW IDLE”灯亮()?A、在空中任何一台发动机的转速低于32%N1时B、在空中任何一台发动机的转速低于32%N2时C、在空中任何一台发动机的转速低于25%N1时D、在空中任何一台发动机的转速低于25%N2时 查看答案