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怎样做一个简易的一分钟计时器

更新时间: 2020-10-05 00:00:00     

1、找一个塑料瓶子,从中间剪断;

2、在瓶盖上扎个眼儿,再把上半部分倒过来放在下半部分上;

3、往上半部分倒一定量的水;

4、让水流一分钟,在水面做个记号;

5、以后再计时把下面的水倒掉,上面再倒一定量的水即可。

关键词: 怎样 一个 简易 分钟 计时

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