A、m<m>subm>>t1m>subm>>=m<m>subm>>a2m>subm>>,α<m>subm>>t1m>subm>>=α<m>subm>>a2m>subm>>,γ=β B、m<m>subm>>a1m>subm>>=m<m>subm>>t2m>subm>>,α<m>subm>>a1m>subm>>=α<m>subm>>t2m>subm>>,γ=β C、m<m>subm>>t1m>subm>>=m<m>subm>>a2m>subm>>,α<m>subm>>t1m>subm>>=α<m>subm>>a2m>subm>>,γ=-β D、m<m>subm>>a1m>subm>>=m<m>subm>>a2m>subm>>,α<m>subm>>a1m>subm>>=α<m>subm>>t2m>subm>>,γ=-β