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给出下列命题 ①过平面外一点有且仅有一个平面与已知平面垂直 ②过直线外一点有且仅...
给出下列命题
①过平面外一点有且仅有一个平面与已知平面垂直
②过直线外一点有且仅有一个平面与已知直线平行
③过直线外一点有且仅有一条直线与已知直线垂直
④过平面外一点有且仅有一条直线与已知平面垂直
其中正确命题的个数为( )
A.0个
B.1个
C.2个
D.3个
考点分析:
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