一台洗衣机的脱水桶正常工作时非常平衡，当切断电源后，发现洗衣机先是振动越来越剧烈，然后振动逐渐减弱，下列说法中正确的是（   ）

贝丁顿社区位于伦敦西南。为减少建筑热损失，建筑师采取了一系列措施，使用可循环利用的建筑材料、太阳能装置等，使这里成为世界上第一个零二氧化碳排放社区。下图示意贝丁顿社区能源循环模式，据此完成下面小题。

关于下列各实验装置图的叙述中，正确的是（　　）

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    Experts say that, among young Internet users, it's not boys who create most web content. The pioneers of the Internet at the moment are the girls.

    According to Jenny Baker, whose hobbies are designing icons（图示）, most boys just aren't patient enough for blogging, uploading photographs, and creating their own websites. Jenny posts her pictures on her own website, and believes that most boys don't often have their own sites. She thinks it's mainly girls.

    And Jenny is right. A study shows that, among Internet users aged 12 to 17, a lot more girls blog than boys (35 percent of girls compared with 20 percent of boys). A lot more girls also work on their web pages (32 percent of girls compared with 22 percent of boys). Girls are also ahead of boys in working on websites for other people.

    Some girls have their own teenage podcasts（播客）which have become very successful and sometimes the creators have their own TV shows too. When asked what they think about the study that shows girls are more active on the web, they say that they're not surprised because girls are very creative, and sometimes more creative than boys.

    Other girl have started interactive（交流的）e-zines with articles written for girls by girls. “Girls from everywhere read our articles, and they ask lots of questions,” they say. “I think girls like to help other people more.” One expert said: “If boys were more interested in helping other people, the numbers would be different.”

    But if girls are more interested in computers, why do women only have 27 percent of computer-related jobs? Maybe this will change in the future—after all, girls like these will be in the job market before too long.

一张100元的人民币，可以换成____张50元，或者还能换成____张10元的。