通过下列化学反应不能达到目的的是( )A．制氯化铁：2Fe + 3CuCl2 = 2FeCl3 + 3Cu B．用稀硫酸除去炭粉中的少量氧化铜：CuO + H2SO4 = CuSO4 + H2O C．
阅读下面文段 ①从天而降的片片雪花给人们带来欢乐, 同时也给人们带来了无须额外投入的清洁能源。 ②专家推算, 10 万吨雪换算成等量
在如右图所示的电路中，当滑动变阻器的滑动头向上滑动时，A、B两灯亮度的变化情况为 （ ）A．A灯和B灯都变亮B．A灯和B灯都变暗C．A灯变亮，B
They often paly _______ on the badminton court.A．badmintonB．basketballC．footballD．volleyball
如图7，点D、E、F分别在AB、BC、AC上，且DE// AC, EF// AB ,下面写出了证明 “”的部分过程，请完成填空： DE// AC, EF // AB, ( ) .(
--Is there any possibility of the film ___________ in Paris International Festival? --Not in the least, because the audience generally think little of it. A. trying out B. tried out C. t
_______ how to do the homework, I went to ask my teacher for help. A. Not to know B. Not knowing C. Knowing not D. Not known
The world is divided into two main parts. The difference is ___41___one part is rich and the other is poor. In the poor part, a lot of people ___42_____get enough to eat. In the rich part, a lot of
