标题: 小测验 [打印本页] 作者: 阳光小院暖茶 时间: 2016-4-14 15:29 标题: 小测验 本帖最后由 阳光小院暖茶 于 2016-4-14 15:55 编辑 % g" k! e$ x; e s; X* ?' j q% u5 t& i; Y. V. j Air is being blown into a spherical balloon at a rate of 1000cm^3/s, How fast Is the radius growing 6 t$ e3 @6 f4 m Bwhen r =10cm?- o6 K8 \, f6 c: @* e; w5 @' } What about the surface area?0 }' ]8 u% q: ^: Y) N! n1 @