关于癫痫下列哪种情况一经诊断，就应用药（）

A.首次发作

B.人生中偶发几次

C.一年发作一次

D.一年发作两次

E.半年内发作两次以上

When a customer withdraws money from the bank, it is required to leave his signature. But how can we be sure it is_______?

A．absolute

B．alternative

C．academic

D．authentic