3.A capillary gas chromatographic method with an electron capture dector (ECD) for the detection of polychlorinated biphenyls (PCBs) in seawater was developed.
摘要建立了毛细管柱气相色谱法测定海水的多氯联苯的方法。
4.In the production process of PCB, there are many defects such as surface smudginess, solder mask unevenness, text excursion, pad damage, track damage etc.
在印刷电路板的生过程,会生外观不整洁、阻焊不均、偏移、线路及焊盘破损等缺陷。
5.Yancheng company serves a wide range of customers including PCB producer, photoelectronics product company, membrane switch producer, scutcheon board and electronics plastic factory etc.