2593| 4
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請(qǐng)問,這種自行車助力器是靠什么結(jié)構(gòu)實(shí)現(xiàn)離合的? |
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點(diǎn)評(píng)
滾輪要驅(qū)動(dòng)車輪保證不打滑必須要保持一定的壓力。
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