案例素材及答案
[shiti]案例素材及答案[/shiti][stversion]未知版本（默认为人教版）[/stversion]
[stauthor]见试卷文件内[/stauthor]
[stsource] [/stsource]
[stintr]
案例素材及答案
(An Li Su Cai Ji Da An)
Case material reachs the solution
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[stdown]试题下载[/stdown]
[stdown1]104679[/stdown1]
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