A.銅、硼、鐵 B.硒、硅、鋅 C.碘、氟、鎳 D.鐵、鋅、鉻 E.鉬、錫、釩
A.農(nóng)業(yè)社會(huì)B.經(jīng)濟(jì)主義C.科技社會(huì)D.社會(huì)主義
A.經(jīng)濟(jì)B.安全C.發(fā)展D.主權(quán)