SN2怎么记

Precambrian strata which are rich in ore-forming elements such as W and Sn are resource layer of the tin poly-metallic deposit and the geothermal incidents afterwards made these elements redistribute.

寒武纪地层的W、Sn等元素含量较高，是重要的矿源层。后期的热事件使成矿元素发生重新分布。

A comparatively systematic study was made of the effect of forming complex compounds in chromophoric system of tetravalent metal ions ( Sn, Ge, Ti and Zr)-o-Cl-PF-CT-MAB by the variation of sulfuric acidity of solution, concentration of surfactant and concentration of chromophoric agent.

本文较系统地研究了溶液硫酸酸度、表面活性剂浓度和显色剂浓度变化对四价金属离子（Sn、Ge、Ti、Zr）O CL PF CT MAb显色体系中配合物形成的影响。

Tin doped indium oxide ( ITO) films were deposited on glass substrates by reactive magnetron sputtering using a metallic alloy target ( In Sn, 90 10).

采用铟锡合金靶（铟锡，90-10），通过直流反应磁控溅射在玻璃基片上制备出ITO薄膜，并在大气环境下高温退火处理。