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。USB转TTL串口模块 CH340G芯片 STC单片机下载 升级 刷机烧录
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CH340G下载线模块USB转TTL STC单片机51 USB转串口升级小板刷机板
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新款CH340G NODEMCU完全兼容老款ESP8266 32M物联网模块
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