“The mobile phase consisted of methanol:water in proportions of 30:70 for the first 6 min, after which the methanol was increased in linearly to 70:30 for the remainder of the analysis time.” 小弟在文献看到这一个句子，它的意思是指6分钟后直接调节醇水比例到70：30， 还是有个过程，也就是以某一速率逐步调到70：30呢？
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