【简答题】性比是种群中雄性个体和雌性个体的____比例。受精卵的雌雄比例大致为1:1,称第一性比;幼体成长到性成熟阶段,由于各种原因,雄性与雌性比持续变化,到个体成熟为止,雄性与雌性的比例叫____ 。个体____后的性比,叫第三性比。
【多选题】以下哪些属于按采购技术分类的战略形式()
【简答题】Nowadays, a complex rate structure would be applied in the hotel. Could you name room rate of a hotel?
【简答题】松属植物成熟的雄配子体由 个退化原叶体细胞、1 个 和1个 组成。
【简答题】用所给单词的适当形式填空 friendly comfort attract complex honesty The workers from countryside want to have a ____house in the city so much. The Chinese students are very____to their new classmates fro...
【单选题】Jean's uncle insisted_____ in that hotel.
D.
she ought not to have stayed.
【判断题】皮亚杰认为个体心理发展的真正原因是个体的成熟机制。( )