She drank and smoked ____ (heavy) for years.
已知m,n是两条不重合的直线,α,β,γ是三个两两不重合的平面,给出下列四个命题:①若m⊥α,m⊥β,则α∥β; ②若α⊥γ,β⊥γ则α∥β③若m//α,n //β,m//n 则α//β ④若m⊥α,m//β,则α⊥β其中真命题是( )