91人妻人人妻人人爽九色,国产午夜一区二区三区影院,狠狠色丁香婷婷综合视频,free嫩白18sx性hd,精品国产av成人,欧美人妻中文字幕s中文字幕,午夜在线观看视频日韩,伊人精品成人久久综合全集观看

1. With the design of bell shaped cylinder head, the sample distribution is more uniform, the sample loading amount can be increased, and the resolution efficiency can be improved;

2. The bellmouth column head can prevent the high-speed flow from damaging the column bed;

3. The stainless steel jacket of the inner glass lined tube of the upper sample column replaces the traditional quantitative ring of the flow injection valve, which is conducive to the preparation of high concentration samples and thorough elimination

4. In addition to the phenomenon of high concentration sample blocking the valve interface;

5. Flange column is easy to disassemble and clean;