解题方法
1 . 如图,DE是正三角形ABC的一条中位线,将△ADE沿DE折起,构成四棱锥
,F为
的中点,则下列各选项正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016579722805248/3018021669076992/STEM/3d1b8f5c529945d4a9e41c29de9d8973.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db2b1c641b93caae9b7a82441e4ba70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016579722805248/3018021669076992/STEM/3d1b8f5c529945d4a9e41c29de9d8973.png?resizew=160)
A.![]() ![]() | B.![]() ![]() |
C.若面![]() ![]() ![]() | D.若![]() ![]() ![]() |
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