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ao yun ji nian bei ru he fang zhi
Author(s): 
Pages: 31
Year: Issue:  12
Journal: Required Reading for Junior Middle School Students

Abstract: <正> 有些同学在解题时,往往只靠死记硬背,生搬硬套,这样常常会得出错误的结论.下面略举一例,并加以分析. 例某城市为支持北京申办2008年奥运会,要建造长、宽、厚分别为3.0m、1.5m、0.3m的纪念碑,所用花岗岩的密度为2.8×103Kg/m3.若纪念碑所放基座能承受的压强为4.5×104Pα,纪念碑应该如何放置才科学合理?说明理由.
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