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空白试验 kòngbái shìyàn
agric.	uniform trial
el.mach.	dummy test
lab.eq.	blank; blank test; blank determination
met.	blank assay
plast.	blank experiment; running a blank
polym.	control test
tech.	dry run; vacancy test; vacancy testing

空白试验: 3 phrases in 3 subjects

Metallurgy	1
Oil / petroleum	1
United States	1