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急!簡單數學是非題!10點

Jan 1st 2014, 15:09

以下為何錯?
1.設A≠B，凡與A ,B等距之點都在線段AB垂直平分線L上
2.若L不垂直E平面，則E上任何線不垂直L
3.設直線L在平面E上,若直線L1與平面E僅相交於一點,且L1⊥L則L1⊥E
4.一二面角恰有一個平面角
5.在空間坐標系中,P(a,b,c)到xy面之距離為c.
6.若|a(向量)|=5,則ra(向量)之長為5r
7.若a(向量), b(向量), c(向量)為空間中三向量,則a(向量)必可化為b(向量), c(向量)之線性組合

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