这是一台获得专利的单柱机，可以用来钻孔或攻丝。
This is a patented single column machine for drilling or for tapping.
本文首先研究了缬氨酸在单根色谱柱上的分离情况。
First, the separation of L-Valine on a single chromatographic column was investigated.
本文首先研究了缬氨酸在单根色谱柱上的分离情况。
First, the separation of L-Valine on a single chromatographic column was investigated.
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