5709| 21
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請(qǐng)教關(guān)于齒輪傳動(dòng)升降產(chǎn)生卡頓問題 |
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點(diǎn)評(píng)
這不正好說明2樓正解么
注意關(guān)鍵詞“當(dāng)反復(fù)升降一天的時(shí)間”,,就是說,剛開始沒問題,?
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