一项筛查试验能将实际无病的人正确地判断为非患者的能力，我们称之为
A．灵敏度B．特异度C．阳性预测值D．阴性预测值E．约登指数
参考答案：B
(2009福建顺昌模拟)——We can never forget the days _______ the two astronauts in spaceship worked together and the days ________ we spent together.
A．when; which
B．which; when
C．what; that
D．on which; when
交流滤波器电容器不平衡保护动作如何处理？
