一个半径为R的扇形,它的周长为4R,则这个扇形所含弓形的面积为( ) A.(2- 发布时间:2017-04-14 19:15 │ 来源:www.tikuol.com 题型:选择题 问题: 一个半径为R的扇形,它的周长为4R,则这个扇形所含弓形的面积为( )A.(2-sin 1cos 1)R2B.sin 1cos 1R2C.R2D.(1-sin 1cos 1)R2
题型:选择题 It’s the protection for the trees ______ really matters, ______ how many trees are planted each year.A.which; or ratherB.as; more thanC.what; other thanD.that; rather than 查看答案