问题
单项选择题
关于电容器,下列说法哪一种不正确()
A.平板电容器的容量与极板的重叠面积和电介常数成正比,与极板间的距离成反比
B.电容器是消耗电场能量的元件
C.平板电容器的容量,极板间充满均匀电介质时比极板间真空时增加了r倍
D.若额定耐压值选择过小,电容器将被击穿
答案
参考答案:B
关于电容器,下列说法哪一种不正确()
A.平板电容器的容量与极板的重叠面积和电介常数成正比,与极板间的距离成反比
B.电容器是消耗电场能量的元件
C.平板电容器的容量,极板间充满均匀电介质时比极板间真空时增加了r倍
D.若额定耐压值选择过小,电容器将被击穿
参考答案:B
完形填空。 "I don't have to go to school. My school __1__ me!" Sara showed me her room. "This is my classroom and this is my teacher and the other __2_ " She pointed to a large radio with a microphone. Sara lives with her parents on a farm in Central Australia. It's about 60 miles from her farm to her neighbors. She can't go to __3__ because her farm is so far away from __4__. There are a lot of children like her in Australia. The ![]() (内地) of Australia. They are at these schools until they are about 12 years old. Sara said, "We talk to our teachers every day on the __6__. And our __7__ last about 30 minutes. Our teachers __8__ us the class work and we do it before our lessons. Twice a year our teacher__9__ us, and once a year all the students _10__. That's the best time of the year. " | ||||
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