樓主: 翔夢隨風(fēng)
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看圖猜原理,這個是怎么傳動的呢,? |
點評
“即使2~3人站在拖板上,,用手旋動光桿時,可不費勁地使拖板作直線運動”,,就是說手的十幾斤力氣能帶動幾百斤的負(fù)荷,??,?�,。。�
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