采用气相色谱法定量时，不必加定量校正因子的方法是（）。
A.归一化法
B．内标法
C．外标法
D．校正面积归一法
参考答案：D
— How about seeing the new movie at the theatre tonight?
— _____ , but I have to go over my notes for tomorrow's exam. [ ]
A. All right
B. Sounds great
C. I can't
D. No, I am terribly sorry
鼓膜完整，传导性耳聋可见于()
A.分泌性中耳炎
B.鼓室硬化
C.耳硬化症
D.听骨链中断
E.胆固醇肉芽肿
