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所有详细答案要写在答题簿上。 there are 2 problems. 【 详细详细详细详细解答解答解答解答】 用恒力f 恰好将质量为m 的滑块沿斜面向上移动到高度h 处,然后用恒力2f 将滑块由高度h处沿斜面向下. Rules and regulations 競賽規則 all questions are in bilingual versions.

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You can answer in either chinese or english. However, if the weights of all the edges are pairwise distinct, it is indeed unique (we won’t prove this now). Please answer each problem starting on a.

所有最后答案要写在答题纸上。 all detailed answers should be written in the answer book.

第i部分 选择题 (16×2 分) 答案. You must have noticed that the two examples are really very similar in nature, and each tries to maximize the flow from source to sink across a network of limited capacity channels. The minimum spanning tree may not be unique.