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
First frost date and late frost date
初终霜日
first frost date and latest frost date
初终霜日
Girst frost date and late frost date
初终霜日
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