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這腳扣該怎么設(shè)計(jì)才能卡在這光滑的電桿上 |
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點(diǎn)評(píng)
國內(nèi)某位大神發(fā)明的,小型汽油機(jī)帶動(dòng),可攀爬樹木,可是樹表面粗糙,摩擦力不是問題。
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