Atrazine,a widely used herbicide,is increasing the agricultural production effectively,while also causing great environm......

阐述了林业贷款中央财政贴息资金管理系统的实现过程和方法.系统采用基于Web的B/S体系的三层结构,使用Oracle为数据管理平台,采用A......

Objective:To investigate the changes of spontaneous and cognitive behavior,and cholinergic M receptors in the brain of m......

Objective:To investigate the changes of spontaneous and cognitive behavior,and cholinergic M receptors in the brain of m......

中亚是盐尘暴高发地区之一,由自然因素和人文因素引起的沙质和盐质荒漠广泛分布.据初步估计,平均每年从干涸的咸海盆地通过空气输......

文章对中原地区新石器时代末期到青铜时代早期的3个代表性遗址——陶寺遗址、新砦遗址和二里头遗址出土的羊骨进行了分析,以探讨当......