题目

关于电容器，下列说法正确的是A．电容器具有“通高频、阻低频”的特性B．耐压值为300 V的电容器可直接接在有效值为220 V的正弦交流电路中C．电容器充的电荷量越多，电容越大D．电容器两端电压越高，电容越大 答案：A    电容器具有“通交流，隔直流，通高频、阻低频”的特性，选项A正确。耐压值是电容器能承受的最大电压，有效值为220 V的正弦交流电的最大值是311 V＞300 V，所以选项B错误。电容器的电容与电荷量Q不成正比，与电压U不成反比，选项C、D错误。 根据根据短文内容，从短文后的选项中选出能坡入空白处的最佳选项。选项中有两项为多于选项。（请将此部分答案填涂到答题卡1-5题相应位置）Although it is fashionable to say that everyone should share the housework equally, in many homes parents do most of it. __1._It is true that young people spend most of the day at school or college and they also have large amounts of homework to do when they come home. 2._ In my view, family life is more pleasant when everyone shares the responsibility for cleaning and tidying because it takes less time._3._ But in my opinion, young people should learn to do them as preparation for the future.Teenagers should share the housework because learning how to do it will help them when they have you look after their own family in the future. _4._ But if they learn to do some basic housework when they are old enough to do it, they won’t be worried about doing the housework in their new grown-up life.Finally, housework is boring if you do it alone. But when families do it together, it gives parents and children a chance to talk to each other about the things that matter to them. _5._For all these reasons, I think that everyone should share the housework.A. In fact, sharing the housework equally is impossible.B. They think they have an important role in their family.C. On the other hand, parents go out to work and come home tired.D. People often argue that parents do the cooking and cleaning better.E. In my opinion, I believe people of all ages should do their fair share.F. Too many young adults leave home without knowing how to cook or clean.G. This greatly improves family life and makes young people more responsible.