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從‘兔子撞樹(shù)’想到許多東西,,哈哈,, |
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點(diǎn)評(píng)
計(jì)算剛度,,其它不要考慮
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點(diǎn)評(píng)
關(guān)鍵是一輩子沒(méi)看見(jiàn)兔子,,怎么辦,?哈哈
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