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4000米0 k2 d3 v! O$ I+ J! V+ S
可以设最多飞x米,则x/1500+x/1200=6
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For human existence is not necessarily meaningful, but there must be the truth of his existence.——Diadawnfly

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小学题……无语……
For human existence is not necessarily meaningful, but there must be the truth of his existence.——Diadawnfly

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