亚洲一二精品,一区二区三区中文字幕在线观看,国产一级毛片高清视频完整版,亚洲va国产va,性欧美在线,国产精品一级在线观看,国产一二在线观看视频网站

News
News
pcb production description(via hole)
2016/7/30 14:54:18

regarding which method to do the via hole.it's a very simple decision.however,there's lot of description from different "words".such as "cover""plug""discover"and so on.this is very big difference.

for example:one USA customer think plug via hole should not have any thing fill inside hole,but you think it is yes has.easy to make misunderstanding.

so,in order to make more clear,aviod problem happen,AKEN make a pics with words description as folloing: