拉呼相关论文
从几天前开始,野鸽子常常鸣叫,有时从早晨-直叫到下午。北风还在肆虐,玻璃窗在风中作响。鸽子们就呆在外面附近的树上,也不换地方,也许它......
The quantum chemical parameters and the topological indices have been calculated for the prediction of the toxicity of a......