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      2. SF-20DC維修視頻

        1、SF-20直流腳架安裝 https://v.qq.com/x/page/v3267mt6zhd.html

        2、SF-20直流腳架電池安裝 https://v.qq.com/x/page/k326766hfds.html

        3、SF-20直流更換調速器 https://v.qq.com/x/page/z31193h0sfk.html

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