The main pollutants are benzene serial materials, polycyclic aromatic hydrocarbon, organochlorine insecticide, PCB and volatile halogenated hydrocarbon.
经过筛选确定苯系物、多环芳烃、有机氯农药、多氯联苯和挥发性卤代烃为主要污染物。
Failure of blind via is one of the main causes of an open circuit in printed circuit board(PCB).
盲孔开裂是导致印制电路板（PCB）电气断路的主要原因之一。
The main advantages of copper are that it's already there (existing cabling and existing FR4 PCB infrastructure), and it's easy to work with.
铜线的主要优势在于，它已经存在（现有的电缆连接和FR4PCB基础），而且它的运用十分方便。
The study about board level drop impact shows that: (1) The mechanical impact and bending of PCB are the main reasons which induce the solder joint stress even the drop failure;
研究结果表明，在跌落冲击条件下：（1）PCB的机械冲击和弯曲变形是导致焊点应力甚至跌落失效的主要原因；
A memory, the main circuit board from the PCB, memory particles, SPD-chip capacitance and the composition of small resistor.
一根内存，主要由PC B线路板、内存颗粒、SPD芯片和各种小电阻电容组成。
Main cleaning workpiece: PCB, machinery parts, metal products, electronic components, optical lenses, plastic products, electroplating before and after cleaning, etc.
主要清洗的工件：线路板、机械部件、金属产品、电子零件、光学镜片、塑胶产品、电镀前后清洗等。
Main materials of printed circuit board (PCB) substrate were macromolecule resins, which were typical viscoelatic materials.
电路板基板材料主要以高分子树脂为主，是典型的黏弹性材料。
Main products are as follows: a circuit board, gilded burnish, gold plated copper thick OSP protection (series), PCB plating copper brightener, PCB tin brightener, etc.
主要产品如下：一、线路镀金光泽剂、线路板镀厚金工艺、线路板铜保护(osp)系列、线路板镀酸铜光亮剂、线路板镀锡光亮剂等。
The main productions:Cleanout Solvent, defoamer, Soldermask Stripper, Film-stripper, the special cleaner for PCB screen cleaning, the Anti-Static film cleaner, Copper cleaner and so on.
主要产品：清槽液、退膜液、消泡剂、绿油剥除剂、菲林清洁剂、洗网水、开油水、防白水；
The main productions:Cleanout Solvent, defoamer, Soldermask Stripper, Film-stripper, the special cleaner for PCB screen cleaning, the Anti-Static film cleaner, Copper cleaner and so on.
主要产品：清槽液、退膜液、消泡剂、绿油剥除剂、菲林清洁剂、洗网水、开油水、防白水；
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