如图,E、F是四边形ABCD的对角线BD上的两点, AE∥CF,AE=CF,BE=DF.求证: ΔADE≌ΔCBF.
2008年9月18日,新华社讯,云南南磷集团寻甸磷电公司发生氯气泄漏致71人中毒。氯气有毒,化工厂常用浓氨水检验管道是否漏氯气,如氯气泄漏,会在
When it comes to eating out, we can't help thinking of big meals in the restaurants, which usually contain much more fat and less fibers. Whether it is a business meeting over lunch or a fast food mea
Buses here are always crowded with passengers, so I prefer _____ there rather than take a bus. A. cycle B. cycling C. to cycle D.
-What do you think of your English teacher? -I like him very much.He is ______ kind ______ hard-working. A.either,or B.neither,nor C.not,or D.not only,but also
写出下列三个符合要求方程式:(1)、甲苯与浓硝酸发生取代反应的化学方程式: ;(2)、在苯酚中加入NaOH
下列有关物质燃烧现象的叙述中,正确的是 A.硫粉在空气中燃烧:产生淡蓝色火焰,生成一种刺激性气味的气体 B.铁丝在氧气中燃烧:火星四射,
文学艺术是时代的产物,同时又能反映时代的风貌。下列各项对应关系正确的是( ) A.工业革命后社会的剧烈变革——现代主义绘画兴起 B.第一