But the material particle DNA sharp separation purification to the ultra centrifugal equipment (supercentrifuge, turned the head with appurtenance) to set a higher request.
而质粒dna的快速分离纯化又对超离心设备(超速离心机、转头和附属设备)提出了更高要求。
Knowledge of the present state allows a sharp separation between the past and the future.
当前状态就将过去与未来作了一个截然的划分。
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