Standard addition method and internal standard method
内标标准加入法
standard of aroma type and standard sample
标准和标样
square root sum of square method
平方总和开方法
difference in difference
倍差法
difference in difference (DD) method
差异中之差异法
Difference-in-difference
双重差分模型
Li is an important theory category in Carving the Dragon .There are lots of Li in Carving the Dragon and they are standard of measuring writers and work.The article illumistrates by the way of writers