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【单选题】
关于导体、绝缘体、半导体能带的特点，以下说法错误的是？A.
导体是在一系列能带中除了电子填充满的能带以外，还有部分被电子填充的能带，称为导带，后者起着导电作用。
B.
本征半导体和绝缘体的能带填充情况是相同的，只有和空带，它们之间的差别只是价带和导带之间的能带隙不同。
C.
导带中只有部分状态被电子填充，外场的作用会使布里渊区的状态分布发生变化。所有的电子状态以相同的速度沿着电场的反方向运动。
D.
能带是不满带，和电场同方向上运动的电子较多，因此产生电流。
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举一反三
【单选题】Questions 12 to 15 are based on the conversation you have just heard.
A.
Quite sleepy.
B.
Very excited.
C.
Rather depressed.
D.
Nearly exhausted.
【单选题】Questions 12 to 15 are based on the conversation you have just heard.
A.
Apply to an American university.
B.
Do research on higher education.
C.
Perform in a famous musical.
D.
Pursue postgraduate studies.
【单选题】Questions 12 to 15 are based on the conversation you have just heard.
A.
They could be a sign of global warming.
B.
They are disturbing Antarctic bird habitats.
C.
They have destroyed research facilities.
D.
They refute current scientific theories.
【单选题】患者男，58岁。因急性心肌梗死行溶栓治疗，下列病情观察最重要的是
A.
观察患者的排便形态
B.
观察患者的尿量
C.
观察患者有无呼吸抑制
D.
观察患者有无出血倾向
E.
观察患者24小时的出入量
【单选题】Questions 12 to 15 are based on the conversation you have just heard.
A.
Tell him to play in her backyard
B.
Do something funny to amuse him
C.
Give him some cherry stones to play with
D.
Warn him of danger by making up a story
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