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作业回顾:硬币用久了,会逐渐失去光泽,也难免附着些污垢,有什么简单又不费力的方法,让硬币闪亮如新呢?上期咖啡猫给大家布置的作业是清洗那些被我们用得脏兮兮的硬币,帮它们恢复光亮色泽。你想到好点子了吗?咖啡猫收到好多同学的来信,在细细评改了一番后,最终决定将优胜奖颁给一位来自山西的小朋友。实验员:张美玲同学所在学校:山西省介休市实验二小五年级11班实验地点:家中实验时间:30分钟准备材料:1个透明玻璃杯、2枚旧硬币、食用醋、食盐、1根筷子(用来搅拌)、1张白纸清洗步骤:
Homework Review: coins with a long time, will gradually lose luster, it is inevitable to attach some dirt, what is simple and effortless way to make the coin shiny as new? Cat coffee for everyone arranged for the operation is to clean up those who are used by us Dirty coins, to help them restore the bright color. Do you think of a good idea? Coffee Cat received a lot of classmates letter, after a careful review of a number, the final decision will be awarded to a winner from Shanxi children. Laboratory: Zhang Meiling Students where the school: Jiexiu City, Shanxi Province experiment two fifth grade 11 Experimental Location: Home Experiment time: 30 minutes Materials: 1 transparent glass, 2 old coins, vinegar, salt, 1 chopsticks (Used to stir), a white cleaning steps: