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The pins on the PCB are dual-column or multi-column components and the layout direction of multiple discrete components regularly arranged should be as consistent as possible and toward the direction of the PCB under design in the production line, as shown in the following figure:咱们可是亲兄弟，打断骨头连着筋。南瓜忙得很，因此不大过去大房那边，便问怎么回事。After several days of experience, we have learned that many plants can be dyed, and pigments are already ubiquitous in plants. However, most plant pigments are easy to decompose and disappear. Only plant pigments that are durable and not easy to be oxidized can be used as dyes.There are about 4,000 species of known medicinal plants throughout Europe, of which more than 300 are used as medicines. Is only China still using botanical drugs? No ~ No ~ No ~ In Europe, its long history can be traced back to Hippocrates in ancient Greece. As for Hippocrates' specific glorious deeds, please Baidu yourself, because I don't know, the history class was skipped by me.Ctrl + K: hyperlink