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已知.那么下列判断错误的是 A. B. C. D. 题目和参考答案 精英家教网
如图.直四棱柱ABCD A1B1C1D1的底面ABCD为平行四边形.其中AB .BD BC 1.AA1 2.E为DC中点.点F在DD1上.且DF . 1 求异面直线BD与A1D1的距离, 2 EF与BC1是否垂直
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C语言中,如何把一段字符串切成固定长度的组,每组有空格,然后输出 例如abcdefgh,输出为 ab cd ef gh
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如图.在 ABC中.AB BC. ABC 90 .BM是AC边中线.点D.E分别在边AC和BC上.DB DE.EF AC于点F.以下结论 1 DBM CDE, 2 S BDE S四边形BMFE, 3 CD
如图.正方形ABCD的边长是16.点E在边AB上.AE 3.点F是边BC上不与点B.C重合的一个动点.把 EBF沿EF折叠.点B落在B 处.若 CDB 恰为等腰三角形.则DB 的长为 . 题目和参考答案
如图.已知 ABC是等边三角形.点D.E分别在边BC.AC上.且CD CE.连接DE并延长至点F.使EF AE.连接AF.CF.连接BE并延长交CF于点G.下列结论 ① ABE ACF,②BC DF
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如图.在 ABC中. ACB 90 . A 60 .AC a.作斜边AB边中线CD.得到第一个三角形ACD,DE BC于点E.作Rt BDE斜边DB上中线EF.得到第二个三角形DEF,依此作下去 则第
如图.正方形ABCD中.AB 3.点E在边CD上.且CD 3DE.将 ADE沿AE对折至 AFE.延长EF交边BC于点G.连接AG.CF.下列结论 ①点G是BC中点,②FG FC,③与 AGB相等的角有