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看圖猜原理,,這個是怎么傳動的呢,? |
點(diǎn)評
“即使2~3人站在拖板上,,用手旋動光桿時,可不費(fèi)勁地使拖板作直線運(yùn)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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