地衣是一种绿藻或蓝藻与一种真菌共生的形式.Lichen is a form in which green or bluegreen algae and a fungus live together symbiotically.但金与其通常的共生元素在树叶中并不是组合共生的.However, no intergrowth of the paragenetic elements was observed in plants.委内瑞拉和古巴仍...
用气体动力学理论分析了子母弹抛撒技术.Cluster warhead dispersing technique is analyzed with gas dynamic theory.建立了火箭子母弹距离修正系统的弹道理论与算法.Build the theory and arithmetic of distance correction system.子母弹药的应用与发展带来了严重的未爆弹药问题.With cargo projectil...