设D,E,F分别为三角形ABC的三边BC,CA, AB的中点,则[img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606173844_90928.png" alt="" />()
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591436386447865.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591436380621016.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591436374528984.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591436368571149.png" />
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正确答案: A 答案分析:无
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