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英语
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The human population is about 7,000 million people and growing steadily.How many significant digit
我想问的是把7000 million 写成科学计数法后,有机位有效数字!一般写成7.0x10^9 有几个有效数字?
人气:404 ℃ 时间:2019-08-20 03:20:21
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