密度大

1.
high-density
城市人口密度大high-density),土地开发面积(housing developing)有限,因此住房短缺(housing shortage)严重。2. 治安压力(security…
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2.
N A N B
设导体A比导体B的自由电子 密度大(N A >N B ),则单位时间由导体A扩散到B的电子数比导体B 扩散到A的电子数多。这时导体A失去电 …
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