搜索欧美日韩东南亚操逼视频,亚洲国产精品成人久久综合网,国产欧美一区二区三区在线老狼,人妻熟妇久久久久久精品无码,国产精品理论片在线观看,国产在线美女,国产精品一区二区制服,久久婷婷一区二区三区

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;