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直角三棱柱體的高是4cm，且BE =( 2/3) EF

Mar 6th 2014, 23:56

知識問題|

發問者：	華 ( 研究生 3 級)
擅長領域：	公路 \| 服裝飾品
發問時間：	2014-03-07 07:56:47 ( 還有 9 天發問到期 )
解答贈點：	10 ( 共有 0 人贊助 )
回答：	0 意見： 0

直角三棱柱體的高是4cm，且BE =(2/3) EF，EF = 4DF。求平面ABCD與底面BCFE所成的角。
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