试验标准确定后，诊断结果的阳性预测值取决于

A．灵敏度

B．特异度

C．患病率

D．符合率

E．约登指数

Lifesaving regulations require that a fire drill include（）.

A.starting the fire pumps

B.checking the operation of watertight doors

C.checking arrangements for abandon ship

D.All of the above