which floor does the girl stop when she comes back from school是什么意思

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• 英语智力测试初二A little girl lives with her family on the tenth floor of a building A little girl lives with her family on the tenth floor of a building .Every morning she goes down in the life.Then she goes to school.She comes back from school in the afternoon and she gets into the lift on the ground floor .She goes up in the lift but she stops at the eighth floor .She gets out and walks up to the tenth floor .Why does she walk from the eighth floor?
• which floor does the girl stop when she comes back from school是什么意思
• which floor does the girl stop when she comes back from school是什么意思
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• 如图所示，在△ABC和△DBC中，∠ACB=∠DBC=90°，点E是BC的中点，EF⊥AB，垂足为F，且AB=DE． （1）求证：△BCD是等腰直角三角形； （2）若BD=8厘米，求AC的长．