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标红部分的器件封装是什么样的？搜了搜相关器件，没头绪啊，特别是U3，请问这些器件不要了可以吗，或者有相关资料么
do not mount说明可以不用安装，但是这个还是要搭配参考设计里的原理图一起看，再决定要不要
