当微扰矩阵元的分母部分取零值，也就是Ek值与Ek'相等的情况下，对于晶体中的电子，其能量函数及波函数都是发散的。
查看答案
能量函数及波函数都是发散的能量分布情况在晶体内是不被允许的。
A. 对
B. 错
采用了简并微扰法重新对近自由电子能量进行了修正得到较为满意的结论。
A. 对
B. 错
-Jack,could you tell me________?-Sure.In the post office on Green Road.
A. where you bought the stamps
B. where did you buy the stamps
C. when you bought the stamps
D. when did you buy the stamps
-I can't find Mary.Where's she?-Sorry,I don't know ________.
A. where has she been
B. where she has been
C. where has she gone
D. where she has gone
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