单项选择题
A.Van WezelB.IllmenseeC.WilmutD.Earle
A.0-2%B.5%-7%C.8%-10%D.10%-12%
A.成活率B.妊娠率C.表达基因阳性率D.重组胚活力
A.1h-10hB.16h-36hC.48h-60hD.60h-72h
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