求助2012年英文文献一篇

john7812x

Survey of nine abortifacient infectious agents in aborted bovine fetuses from dairy farms in Beijing, China, by PCR.4 j. {* q  U4 y) C" u+ }

, D& ]2 Z; |7 C1 ^, j8 FActa Vet Hung. 2012 Mar;60(1):83-92.
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Yang N, Cui X, Qian W, Yu S, Liu Q.
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http://www.ncbi.nlm.nih.gov/pubmed/22366134% _* Q3 X3 z7 m$ @1 e( U5 a

wrh-alon

求When Are Two Heads Better than One and Why?

juxingda

希望有帮助