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若平面α∥平面β,点A,C∈α,点B,D∈β,且AB=48,CD=25,又CD在...
若平面α∥平面β,点A,C∈α,点B,D∈β,且AB=48,CD=25,又CD在平面β内的射影长为7,则AB和平面β所成角的度数是 .
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如图,∠C=90°,AC=BC,M,N分别为BC和AB的中点,沿直线MN将△BMN折起,使二面角B′-MN-B为60°,则斜线B'A与平面ABC所成角的正切值为( )
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C.
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在正方体ABCD-A
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1D
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1的正切值为( )
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B.
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C.
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将锐角∠QMN=60°,边长MN=a的菱形MNPQ沿对角线NQ折成60°的二面角,则MP与NQ间的距离等于( )
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如图,在棱长为2的正方体ABCD-A
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B.
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C.
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设
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,
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,
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是任意的非零向量,且相互不共线,下列命题:
(1)
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,
(2)
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(3)
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不与
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垂直,
(4)
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.
其中正确的命题有( )
A.(1)(2)
B.(2)(3)
C.(3)(4)
D.(2)(4)
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