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发表于 2018-1-8 19:30
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本帖最后由 confused-maoan 于 2018-1-8 19:33 编辑
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9 g" r% `! ?. {8 Z: H/ d我的理解是 :当移除closure后,开孔面积 肯定是要大于passage,而这段文字说不能大于passage$ I: I9 t1 i' Z& ?2 y1 p- d
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