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6 questions
哪一種滑輪能夠省力?
定滑輪
動滑輪
哪種滑輪可以改變施力的方向?
哪一種物品運用了摩打?
單車
釣魚竿
洗衣機
電視機
根據圖示,小齒輪轉動後,大齒輪轉動的方向是甚麼?
順時針
逆時針
根據圖中電池的位置,摩打會沿哪個方向轉動?
哪種滑輪的中心軸能夠移動?
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