图甲是《墨经》中记载的古代提升重物的工具——“车梯”,图乙是其等效图。若利用此“车梯”使1000n的重物在10s内沿直线匀速竖直上升2m,拉力 Template




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tomski图甲是《墨经》中记载的古代提升重物的工具——“车梯”,图乙是其等效图。若利用此“车梯”使1000n的重物在10s内沿直线匀速竖直上升2m,拉力 coloring