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哇 后面第二步取 AB杆作为整体然后算B点处的力矩! 妙哉! 阅读全文
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[POI2008]BLO-Blockade 题面翻译 B 城有 $n$ 个城镇,$m$ 条双向道路。 每条道路连结两个不同的城镇,没有重复的道路,所有城镇连通。 把城镇看作节点,把道路看作边,容易发现,整个城市构成了一个无向图。 请你对于每个节点 $i$ 求出,把与节点 $i$ 关联的所有边去掉以后 阅读全文
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https://zhuanlan.zhihu.com/p/226794136 阅读全文
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The past few years have seen a worrying trend that more and more youngsters are falling prey to cunsumerism,accumulating a staggering sum of debt that 阅读全文
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on the Earth(not in!) cannot imagine what it will be like(not what will be like) The following are the …(not followings) humans can…(not human) nowada 阅读全文
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The effects of and solutions to global warming 字数:280 With private cars counting a larger proportion of public transport nowadays,the challenge we fac 阅读全文
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