Switching to the metallurgical microscope in a top-down view, looking at a good bond first, we can see a rough textured surface on the gold contact pad, with the gold wire coming in from one side and compressed into a crescent shape by the ball-bonding capillary (hence why some sources refer to the second bond as a “crescent bond”). The gold wire and gold pad appear to be well connected, and a deep circular indentation is visible in the pad which goes through the gold into a silvery base metal.
李 “대통령·집권세력 됐다고 마음대로 해선 안 돼…권한만큼 책임 커”
，推荐阅读新收录的资料获取更多信息
Rebecca Morelle,Science Editorand，这一点在新收录的资料中也有详细论述
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