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Mr. Li used the computer to input an article. After 3 hours, he entered 1 / 3 of this article. At this speed, Mr. Li worked 8 hours and could input this article
A few parts of the article
Mr. Li used the computer to input an article. After 3 hours, he entered 1 / 3 of this article. At this speed, Mr. Li worked 8 hours and could input this article
A few parts of the article
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