若22•16n=(22)9,解关于x的方程nx+4=2.
①城濮之战 ②“围魏救赵” ③长平之战 ④即墨之战
In Northern California, a wildfire has ____(传播,蔓延) a haze of smoke over 200 miles.
①反对适度消费
②健全社会保障体系
③增加居民收入
④减少商品供应
半圆的周长就是圆周长的一半.
He promised ________ his old friend during his stay in Tianjin