半衰期的表示方法是（）.
A．t1/2
B．Cmax
C．tmax
D．AUC0→∞
E．Cl
参考答案：A
—What upsets him?
—________ his computer is out of order.
A．Whether
B．What
C．That
D．How
药品检验应有完整的原始记录并保存（）年？
A.[3]
B.[4]
C.[5]
D.[6]
