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關(guān)于擺渡車輪子材質(zhì)選擇的問(wèn)題 |
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點(diǎn)評(píng)
一個(gè)是質(zhì)的問(wèn)題,,一個(gè)是量的問(wèn)題。地面被壓得坑坑洼洼后,,輪子陷在坑里,,再小得摩擦系數(shù)又有什么用呢。
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