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A.1 | B.2 | C.3 | D.4 |
A..若m⊥α,m⊥β,则α∥β. | B.若l⊂α,α∥β,则l∥β |
C..若m∥n,m⊥α,则n⊥α | D..若l⊂α,α⊥β,则l⊥β |
A.∀x>0且x≠1,都有x+
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B.∀a∈R,直线ax+y=a恒过定点(1,0) | ||
C.∃m∈R,使f(x)=(m-1)•xm2-4m+3是幂函数,且在(0,+∞)上单调递减 | ||
D.∀φ∈R,函数y=sin(2x+φ)都不是偶函数 |
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