Judging from the appearance change during degradation, PGLA barrier has a better appearance retention than PGA barrier.
从外观上，PGLA牙周片降解过程中的形态保持比PGA牙周片好。
Then, the fabric basic mechanical property indexes characterizing the leisure trousers appearance retention are gained through applying grey system theory.
然后运用灰色理论获得了表征休闲西裤外观保持性的织物基本力学性能指标。
The gradient elution is reasonable when the retention time is 2.3 times after the appearance of prominent peak with initial mobile phase acetonitrile-water (40:60).
用初始流动相乙腈-水(40：6 0)洗脱至主峰出峰保留时间的2.3倍时开始进行梯度洗脱比较合理。
The gradient elution is reasonable when the retention time is 2.3 times after the appearance of prominent peak with initial mobile phase acetonitrile-water (40:60).
用初始流动相乙腈-水(40：6 0)洗脱至主峰出峰保留时间的2.3倍时开始进行梯度洗脱比较合理。
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