题目

英语翻译
Below is a description of a single scientific experiment.It shows us how iron reacts ( 反应) with air and with water.
Aim :To find out if iron rusts( 生锈) (a) in dry air ; (b) in water that has no air in it ( air- free water) ; (c) in ordinary water.
Materials :3 clean iron nails ( 铁钉) ; test tubes ; test tube holder ; cotton wool ; oil ; Bunsen burner.
Iron in dry air
Method
(1)Put some iron nails at the bottom of a test tube.
(2)Push some cotton wool down the tube.
(3)Leave the tube for one week.
Result
After one week,the nails have not rusted.
Conclusion
Iron does not rust in dry air.
Iron in air-free water
Method
(1)Half-fill a test tube with water.
(2)Boil the water for three minutes.(This makes sure there is no air in the water.
(3)Put two or three clean nails in the water.
(4)Add some oil to the water.(This will keep air out of the water.)
(5) Leave the tube for one week.
Result
The nails do

提问时间：2020-05-28

答案

下面是一个简单的科学试验,它告诉我们铁在空气和水的环境下会发生什么反应.实验目的: 找出铁在下面的条件下是否会生锈a) 在干燥的空气里b) 在没有空气的水里c) 在普通水里实验器材：3个干净铁钉 试管 试管架 原棉 油...