无穷级数的收敛性与发散性与此概念有关.Convergence and divergence of infinite series depend upon this concept.我们用一块负透镜,它将使光线发散一些.We introduce a negative lens which will diverge the rays a bit.高辐射功率的光束会有高的发散度.A beam of high radiant power wil...
Amnesty workers have been barred from Sri Lanka since 1982...从1982年起，大赦国际的工作人员就被禁止进入斯里兰卡。Sri Lanka had considerable scope for influencing world prices for tea in the early 1960 s.在六十年代初期,斯里兰卡有相当大的力量影响世界茶叶的价格.Burma is nor...