1．已知集合A={1,2,3,4},B={y|y=
,x
A},则A
B=( )
A. {1,2,3,4} B. {1,2} C. {1,3} D. {2,4}
|
、β是两个不同的平面，则下列命题中正确的是( )
A．若m∥n，m∥，则n∥
B．若⊥β，m∥，则m⊥β
C．若⊥β，m⊥β，则m∥
D．若m⊥n，m⊥，n⊥β，则⊥β
、β是两个不同的平面，则下列命题中正确的是( )
1．已知集合A={1,2,3,4},B={y|y=,xA},则AB=( )
A. {1,2,3,4} B. {1,2} C. {1,3} D. {2,4}
|
、β是两个不同的平面，则下列命题中正确的是( )
A．若m∥n，m∥，则n∥
B．若⊥β，m∥，则m⊥β
C．若⊥β，m⊥β，则m∥
D．若m⊥n，m⊥，n⊥β，则⊥β
you can compose your response. You
can turn your pain into profanity - or
into poetry. The choice is up to you. You may not have chosen your tough time,
but you can choose how you will react to it.