不管
如图所示,一平行板电容器与一电源相连,在A、B两极板间的某点0处,有一带电油滴恰好静止,此时两极板间的电势差为UAB,现将A板缓慢向上平移,则( ).
如图所示,一平行板电容器与一电源相连,在A、B两极板间的某点0处,有一带电油滴恰好静止,此时两极板间的电势差为UAB,现将A板缓慢向上平移,则( ).
新民主主义革命时期,党内犯“左”倾错误的人提出“毕其功于一役”的主张,搞所谓的“无间断”革命,这种错误倾向实质上是( )。
新民主主义革命时期,党内犯“左”倾错误的人提出“毕其功于一役”的主张,搞所谓的“无间断”革命,这种错误倾向实质上是( )。
Practice 12 (1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and was
Practice 12 (1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the
_____ people say, I believe he is as innocent as a baby unborn.
\_\_\_\__ people say, I believe he is as innocent as a baby unborn.
Large quantities of water _____ for irrigation.
Large quantities of water \_\_\_\__ for irrigation.
痕迹的研究目前正在逐渐形成一门科学。在痕迹的应用上,用来侦破案件大概是最常见的事。一个罪犯无意间在茶杯上留下指纹,他很快就成为了瓮中之鳖。间谍用显影药水书写密信,不管隐蔽多巧妙,一经特别显影就“真相大白”。最近美国人发明了一种侦破新技术——头发分析,可测出一百分之一到一亿分之一克的微量元素,头发中的十种元素,铝、钠、铁、氯……尽管微乎其微,仍会留下“影子”,这对于鉴别罪犯无疑提供了有力的证据。 人类巧妙地利用痕迹的例子有不少。例如我们祖先留下的劳动工具,出土的石斧、石刀,其中有磨损的印迹,虽然岁月使之模
痕迹的研究目前正在逐渐形成一门科学。在痕迹的应用上,用来侦破案件大概是最常见的事。一个罪犯无意间在茶杯上留下指纹,他很快就成为了瓮中之鳖。间谍用显影药水书写密信,不管隐蔽多巧妙,一经特别显影就“真相大白”。最近美国人发明了一种侦破新技术——头发分析,可测出一百分之一到一亿分之一克的微量元素,头发中的十种元素,铝、钠、铁、氯……尽管微乎其微,仍会留下“影子”,这对于鉴别罪犯无疑提供了有力的证据。