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一块半导体薄片置于磁场中（磁场方向垂直于薄片），当有电流流过时，电子受到洛仑兹力作用而发生偏转。结果在半导体的后端面上电子有所积累，而前端面缺少电子，因此后端面带___电，前端面带_电，在前后端面形成电场，该电场产生的力阻止电子继续偏转；当两力相平衡时，电子积累也平衡，这时在垂直于电流和磁场的方向上将产生电场，相应的电势称为______。

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绝缘体和金属导体不存在霍尔效应，一般霍尔元件应采用半导体材料。

A. 对
B. 错

Muslims mostly live in the areas of _, _, and 4 autonomous prefectures and 13 autonomous counties in other parts of China.

A. the Xinjiang Uygur Autonomous Region
B. Ningxia Hui Autonomous Region
C. the Inner Mongolia Autonomous Region
D. the Guangxi Zhuang Autonomous Region

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Islam was founded by the _ prophet Muhammad and was introduced into China in the _ century.

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The Great Mosque in Xi'an is one of the oldest, largest and best-preserved Islamic mosques in China.

A. 对
B. 错

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绝缘体和金属导体不存在霍尔效应，一般霍尔元件应采用半导体材料。

Muslims mostly live in the areas of _______, _______, and 4 autonomous prefectures and 13 autonomous counties in other parts of China.

Islam was founded by the _______ prophet Muhammad and was introduced into China in the _______ century.

The Great Mosque in Xi'an is one of the oldest, largest and best-preserved Islamic mosques in China.

Muslims mostly live in the areas of _, _, and 4 autonomous prefectures and 13 autonomous counties in other parts of China.

Islam was founded by the _ prophet Muhammad and was introduced into China in the _ century.