根管消毒不宜采用下列哪种药物
A．抗生素
B．甲醛甲酚
C．木榴油
D．2%碘酊和75%乙醇
E．复方碘剂
参考答案：D
半衰期T1/2和衰变常数λ的关系是（）
A、T1/2＝ln3/λ
B、T1/2＝ln4/λ
C、T1/2＝ln2/λ
D、T1/2＝ln5/λ
Excuse me, but could you tell me _______?
A．what is your name
B．how I can call this young lady
C．what is the matter with you
D．how long the dog has died
