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【简答题】
N型半导体是在本征半导体中掺入极微量的 价元素组成的。这种半导体内的多数载流子为 ,少数载流子为 ,不能移动的杂质离子带 正 电。P型半导体是在本征半导体中掺入极微量的 价元素组成的,这种半导体内的多数载流子为 ,少数载流子为 ,不能移动的杂质离子带 负 电。
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举一反三
【简答题】下列各组词语中加点的字的读音 , 与所给注音全都相同的一组是 ( )A. 号 háo 号叫 号丧 呼号 号啕大哭 B. 强 qiánɡ 强制 强迫 强化 强词夺理 C. 帖 tiè 法帖 碑帖 画帖 俯首帖耳 D. 累 lěi 累计 连累 累赘 危若累卵
【简答题】When I was far away from home, I often think of my parents in the d______.
【单选题】下列加点字的注音全都正确的一项是
A.
吞 咽 (yān) 碑 帖 (tiè) 煞 费苦心(shà)
B.
连 累 (lèi) 打 擂 (lèi) 方兴未 艾 (ài)
C.
慰 藉 (jiè) 刹 车(shā) 冠 冕堂皇(guān)
D.
蹊 跷(qī) 粘 贴(zhān) 臧 否人物(zàng) ( )
【简答题】阅读理解。 When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived on a farm. In the winter especially, we wear quite out off from the outside world. As soo...
【单选题】听力原文： When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived on a farm. In the winter especially, we were quite cut off from the outside world. As soo...
A.
Staying on the farm.
B.
Leaving home for the city.
C.
Moving to the countryside.
D.
Running away from the school.
【简答题】When I was a boy I was very shy and I often felt (comfort) ______ especially with strangers.
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