维甲酸异构体的微柱固相萃取过程包括柱老化、上样、 洗涤、 洗脱以及柱再生等步骤。

The sensitivity was improved more than 100-fold. The extraction procedure included conditioning, loading, washing, eluting and regenerating.

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在对梁的受拉伸与自重情形下的老化作了分析后，举例分析了真实固体火箭发动机药柱的长期老化效应。

After having solved the aging problems of beams, the long term aging effect of a solid propellent grain is also analyzed as an example.

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对未完全损伤的柱子，以老化色谱柱提高柱效，严重损伤、老化者，应更换新柱；

Badly damaged or aged chromatogram column should be substituted by new ones, if not fully damaged, it could be improved by aged chromatogram column.

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