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看圖猜原理,,這個(gè)是怎么傳動(dòng)的呢,? |
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點(diǎn)評(píng)
“即使2~3人站在拖板上,,用手旋動(dòng)光桿時(shí),,可不費(fèi)勁地使拖板作直線運(yùn)動(dòng)”,就是說手的十幾斤力氣能帶動(dòng)幾百斤的負(fù)荷,?,??�,。,。�
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