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This is an ____(换乘) station. please _(照顾) your children and belongings. The last train to Tianfu Square from Xipu in Line 2 is _(晚点) Due to an emergency, the station is temperarily (关闭) My passport is _(丢失). Can you help me to find it

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电介质的击穿形式有

A. 热击穿
B. 电击穿
C. 电化学击穿
D. 老化击穿

气体电介质伏安特性曲线分为哪几个部分？

A. 当电场很弱时，电流密度随电场强度的增加正比例地上升
B. 当电场逐渐增加电流密度不再因电场强度的增加而改变，达到饱和
C. 当电场逐渐增加伏安特性曲线逐渐偏离线性关系
D. 电流密度再次因电场强度的增加而上升，最后当电场强度达到某一临界值Em时，电流密度无限的增大，气体的绝缘性能丧失，介质被击穿

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热击穿是温度增加到某一临界值时，电导率突然剧增，电介质丧失其固有的绝缘性能，变成导体。

A. 对
B. 错

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气体能导电是因为气体中存在一定浓度的带电正负离子。

A. 对
B. 错

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This is an ________(换乘) station. please _______(照顾) your children and belongings. The last train to Tianfu Square from Xipu in Line 2 is _____(晚点) Due to an emergency, the station is temperarily ______(关闭) My passport is _____(丢失). Can you help me to find it

电介质的击穿形式有

气体电介质伏安特性曲线分为哪几个部分？

热击穿是温度增加到某一临界值时，电导率突然剧增，电介质丧失其固有的绝缘性能，变成导体。

气体能导电是因为气体中存在一定浓度的带电正负离子。

This is an ____(换乘) station. please _(照顾) your children and belongings. The last train to Tianfu Square from Xipu in Line 2 is _(晚点) Due to an emergency, the station is temperarily (关闭) My passport is _(丢失). Can you help me to find it