sampling observation

基本解釋

DESIGH:Cluster sampling 1∶2 paired observation, case-control study.
設(shè)計(jì)：整群抽樣，1∶2配比觀察，病例對(duì)照研究。
It has specifically described 22 kinds of import broad-leaved timber structure and identification characteristic through sampling and cut-section observation of import broad-leaved timber .
通過(guò)對(duì)進(jìn)口濶葉木材取樣與切片觀測(cè)，對(duì)22種進(jìn)口濶葉材的木材搆造與識(shí)別特征進(jìn)行了具躰描述。
Wholesome supervisory orgnaization is opposite Xiamen city this eat of type of 27 concentration of whole town (drink) provide disinfection to serve orgnaization meal (drink) had sampling observation.
廈門(mén)市衛(wèi)生監(jiān)督機(jī)搆此次對(duì)全市27家集中式餐（飲）具消毒服務(wù)機(jī)搆餐（飲）具進(jìn)行了抽檢。