...主板 cardinal plate; end stopper & key plate; main board, main control board, main processing board; mainboard; mother board; motherboard; pcb-main 精英 1.(精华) cream; essence; quintessence 传统文学艺术的精英 the essence of traditional art and literature2.
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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FR4 PCB基础），而且它的运用十分方便。
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