In this paper we study the necessary conditions for the masses of the nested regular polygon solutions of the planar 2N-......

通过蒸发捕集法与溶液吸收法两种前处理方法,利用高分辨电感耦合等离子体质谱对高纯氨中痕量金属杂质进行上机检测.实验表明,双聚......