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A.0个 | B.1个 | C.2个 | D.3个 |
A.若α⊥γ,β⊥γ,则α∥β | B.若 m⊥α,m⊥β,则 α∥β |
C.m⊥β,α⊥β,则 m∥α | D.n⊥m,n⊥α,则 m∥α |
A.1个 | B.2个 | C.3 个 | D.4个 |
A.“x2=1”是“x=-1”的充分不必要条件 |
B.“x=2”是“x2-5x+6=0”的必要不充分条件 |
C.命题“∃x∈R,使得x2+x+1<0”的否定是:“∀x∈R,均有x2+x+1<0” |
D.命题“若x=y,则sinx=siny”的逆否命题为真命题 |
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