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二次抽样
busin.
double sample
ecol.
subsampling
el.mach.
double sampling
hydroel.st.
subsample
oil
sub sample
proj.manag.
sub-sampling
tech.
secondary sampling
;
two-stage sampling
二 次 抽样
:
4 phrases
in 3 subjects
Business
2
Statistics
1
Technology
1
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