小红学习了滑轮之后,用一根绳和一根滑轮,借助木桩设计出图(甲

小红学习了滑轮之后,用一根绳和一根滑轮,借助木桩设计出图(甲)装置,将船拉上海滩,小明分析后,认为不太合理,请在图(乙)中画出你的方法(把绳和滑轮画出来,并标出木桩的位置)

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