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【多选题】
关于元素半导体硅和锗的能带结构特征,以下说法错误的是:A.
锗的价带结构与硅的相似，都存在极大值相重合的2个价带，外能带为重空穴带，内能带为轻空穴带。
B.
锗的导带极小值点位置与硅的不同，锗的位于<111>方向的布里渊区边界上，硅的位于<100>方向且不在边界上。
C.
硅的导带底在简约布里渊区中有6个旋转椭球等能面，锗的导带底在简约布里渊区里有8个旋转椭球等能面。
D.
硅和锗的导带底和价带顶都在k空间的不同k值处，因此都是直接带隙半导体材料。
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举一反三
【简答题】A．She is quite good at it. B．She is of average level. C．She fails most of the exams. D．She is about to give up.
【多选题】Watch the video. Which ideas does she support?
A.
There are two parts of your personality.
B.
Your environment affects your temperment.
C.
To change a habit, write down a plan.
D.
Keep track of what you do.
E.
Say negative things about the habit.
F.
Avoid activities and places that cause trouble.
G.
Tell your plan to someone who will lecture at you.
H.
Tell a really good friend.
I.
Reward yourself with food.
J.
Keep track of your successes.
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