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三十秒原则(三十秒等于多少毫秒)


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网站只需要你有小学数学水平即可。。。在30秒内快速算出简单的加减乘除法,结束后会统计出你答对了多少,平均时间及在哪个问题上浪费的时间最多等数据。。。

三十秒限时速算-Speedsums

传送门 http://www.speedsums.com/ 

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