copy and paste this google map to your website or blog!
Press copy button and paste into your blog or website.
(Please switch to 'HTML' mode when posting into your blog. Examples: WordPress Example, Blogger Example)
Input Form:Deal with this potential dealer,buyer,seller,supplier,manufacturer,exporter,importer
(Any information to deal,buy, sell, quote for products or service)
几大数学软件各有什么优缺点？ - 知乎 In general Maple is more powerful on solving Integral equations, differential equations and Groebner basis, Mathematica is more powerful for integration, recurrence relations, equation solving and simplification
g 应是 9. 8 N kg，还是 9. 8 m s²？ - 知乎 的回答。 这个问题的本质就是普通的单位换算 N kg=kg\cdot m\cdot s^ {-2} kg=m s^ {2} ，跟等效原理没有任何关系，也跟广义相对论没有任何关系。因为对于一个完全由牛顿引力理论描述而不遵循广义相对论的宇宙，在其中 9 8N kg=9 8m s^ {2} 仍然是成立的。