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即截面是直角梯形
! K$ t' r2 f% F962843960 发表于 2011-7-23 14:46  # V( y8 v/ F0 T! ^; b7 o
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/ }8 O) J4 K6 U; M' S1 w7 V( ` 是这吗
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+ d3 E; e! z8 T; v* s4 mhttp://www.askcad.com/bbs/thread-33955-1-1.html |
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