精品二区久久I成人高清av在线I成人精品久久I中文字幕 国产精品I久久精品视频在线看I国产日韩欧美网站

1. The unique screw type column head design can be directly installed by hand, which is convenient for operation and disassembly;

2. Integrated column head, zero dead volume design;

3. The column pipe can be extended seamlessly through the connector to facilitate the installation of the column;

4. All pipelines are international standard parts, common to all kinds of equipment;

5. Withstand voltage 5bar;