agricultural geological survey sample
geological survey sample
remote sensing interpretation sample plot
remote sensing sample survey
Sample plot positioning
sample survey
抽样检查
抽样检验
样本甸
样本调查
先行甸
抽样调查
取样调查
抽样
small sample plot method
The Second China National Sample Survey on Disability
the Second China National Sample Survey on Disabil
Cross-section Survey and Profiles Survey