临床应用AEDS，如需换药，两种药物的叠加用药期为（）
A.4周
B.5周
C.1周
D.3周
E.2周
参考答案：C
—Can you tell me _______?
—She is in the computer lab.[ ]
A. where Linda was
B. where is Linda
C. where was Linda
D. where Linda is
为什么PN结探测器结区不能做得很厚？这个缺点带来了什么问题？
