地球北纬圈上有两点,点在东经处,点在西经处,若地球半径为,则

地球北纬圈上有两点,点在东经处,点在西经处,若地球半径为,则两点的球面距离为 ______________. 

答案

相关题目

多酶片中含有蛋白酶、淀粉酶和脂肪酶,具有辅助消化的作
多酶片中含有蛋白酶、淀粉酶和脂肪酶,具有辅助消化的作用。其片剂是糖衣片,这样制作的目 的是 A.补充体内糖类物质供给              B.
下列关于辛亥革命历史意义的表述,不正确的是: A.结束了
下列关于辛亥革命历史意义的表述,不正确的是: A.结束了延续两千多年的封建君主专制制度  B.使民主共和的观念深入人心 C.为民族资本主义的
We had built three bridges over the river _______ the end of 1994.A.atB.onC
We had built three bridges over the river _______ the end of 1994.A.atB.onC.forD.by
With his excellent skills, he is considered worthy to        in the nat
With his excellent skills, he is considered worthy to        in the national football team. A. take a seat           B. have a place    C. take chair           D. have
《齐民要术》中有这样一段描述:“凡五果,花盛大时遭霜
《齐民要术》中有这样一段描述:“凡五果,花盛大时遭霜,则无子。天雨新晴,北风寒彻,是夜必霜。此时放火作熅,少得烟气,则免于霜矣。”[熅
Make sure the gas is turned off after a bath, which would _______ cause danger
Make sure the gas is turned off after a bath, which would _______ cause danger. A.somehow                B.meanwhile           C.otherwise                D
相同条件下,下列各组热化学方程式中,ΔH1<ΔH2的是 A.1/2H2
相同条件下,下列各组热化学方程式中,ΔH1<ΔH2的是 A.1/2H2(g)+1/2Cl2(g)====HCl(g);ΔH1    H2(g)+Cl2(g) ====2HCl(g);ΔH2B.S(g)+O2(g) ====SO2(g);ΔH1   S(s)+O2(g) ====SO2(g
先化简,再求代数式的值,其中x=2014.
先化简,再求代数式的值,其中x=2014.

最新题目