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一個(gè)簡(jiǎn)單的三視圖問(wèn)題,,卻難倒了一個(gè)老工程師,!大家都來(lái)看看,! |
點(diǎn)評(píng)
好像不對(duì)吧,?除非是省略虛線,否則凹凸三角不能并存
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