The microanalytical method of elemental sulfur include chemical method and instrumentalmethod such as Electrochemical analysis, Chromatography, XPS et.
微量元素硫的分析方法有化学法和电化学法、色谱法、XPS等仪器方法。
2
Once just an obscure statistical method, instrumental variables are now popping up all over the place.
“工具变量”以前只是一种模糊统计方法，而如今却满天飞舞。
3
Through instrumental variable identification method, the single input single output difference equations and the Z transfer function were gotten.