滞尘是什么意思?
- 时间:2020-04-22 15:41:35
- 分类:数学世界
- 阅读:159 次
滞尘是什么意思?尘埃飘(经)过森林时,约有四分之一被树叶树干吸附或者滞留在森林的空间里,最后降落到森林的地面。森林的这一吸尘降尘的作用用术语来说称滞尘。
同样道理,风经过森林会减少风量和降低风速,用术语来说称防风。
人教版四年级上册第四单元《三位数乘两位数》练习中有这样一道题(P49):某市郊外的森林公园有124公顷森林。1公顷森林一年可滞尘32吨,一天可以从地下吸出85吨水。
(1)这个公园的森林一年可滞尘多少吨?124×32
(2)这个公园的森林一天可以从地下吸出多少吨水?124×85
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