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- 1下列反应属于氧化还原反应,但水既没有做氧化剂又没有做还原剂的是( ) A.2F2+2H2O=4HF+O2 B.3NO2+H2O=2HNO3+NO C.2Na+2H2O=2NaOH+H2 D.CaO+H2O=Ca(OH)2
- 2一个数亿位上是8,万位上是5,个位上是3,百分位上是7,其余各位是0,这个数写作( ),读作( )
- 3An owl is a bird with very large eyes .Those eyes make the owl look clever .The owl can not move its eyes freely as we c
- 4氨气的结晶是什么化合物《离子或共价》
- 5丽丽家上月用电50度,本月比上月节约了10度,比上月节约( ) A.80% B.50% C.40% D.20%
- 6规定符号“△”的意义为:
- 7she biggest problen is that her too busy.
- 8现在有一题,中文提示,完成句子的:what is …………(学英语的正确方法) 请问括号里的提示该怎么翻译
- 9举例说明函数的导数不一定可导
- 10What will you do when you grow up?