16.已知四个面都是直角三角形的三棱锥其中三个面展开后构成一直角梯形abcd如图ad⊥abad⊥dcab=2bc=cd=1则 Template




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tomski16.已知四个面都是直角三角形的三棱锥其中三个面展开后构成一直角梯形abcd如图ad⊥abad⊥dcab=2bc=cd=1则 coloring