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若斜线段AB是它在平面α内射影长的2倍,则AB与平面α所成的角为 .
若斜线段AB是它在平面α内射影长的2倍,则AB与平面α所成的角为 .
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若
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=(2x,1,3),
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=(1,3,9)共线,则x=
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用符号语言表示语句:直线a经过平面α外一点M
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有四根长都为2的直铁条,若再选两根长都为a的直铁条,使这六根铁条端点处相连能够焊接成一个三棱锥形的铁架,则a的取值范围是( )
A.(0,
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B.(1,
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C.(
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,
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D.(0,
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设α、β、γ是三个不重合的平面,l是直线,给出下列命题,其中正确命题的个数是( )
①若α⊥β,β⊥γ,则α⊥γ;
②若l上两点到α的距离相等,则l∥α;
③若l⊥α,l∥β,则α⊥β;
④若α∥β,l⊄β,且l∥α,则l∥β.
A.1个
B.2个
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在正方体ABCD-A
1BC
1D
1中,点P在线段AD
1上运动,则异面直线CP与BA
1所成的角θ的取值范围是()
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A.
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B.
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C.
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D.
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