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
搜题请搜索小程序“爱下问搜题”
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
参考答案：B
| 写作。 | ||||||||||
| 某市出台了一项环保措施,为每个家庭提供三种颜色的垃圾回收筒.请根据下面 提供的信息,用英语写一篇120词左右的短文,介绍调查结果. 注意:1.英文提供的背景仅作参考,主要介绍表格显示的调查结果. 2.文章的开头已给出,不计入总词数. ﹡The yellow bin is for paper,bottles,cans and plastic that can be sent to a factory for making new products. ﹡The green bin is for garden rubbish which is then turned into mulch(肥料)for the garden. ﹡The smaller,red bin is for rubbish that cannot be recycled. Recently the city conducted a survey to find out how many households were using the bins and the following shows the result. Percentage of households using recycling bins (number of households:100 000;percentage of households with garden:60%)
——————————————————————————————————— ——————————————————————————————————— |