The human population is about 7,000 million people and growing steadily.How many significant digit

The human population is about 7,000 million people and growing steadily.How many significant digit

题目
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?
答案
10
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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