=∑N==0 或者∈;dN+∈,dN,+…+∈,dN=0(4) (3)×a+(4)×阝+(2)=(5) (Oh t/aN+a+BE,dN,+ I(Oht/aN2)+a+BE, ]dN,+ (5) +[(ht/OM)a+B∈;]dN=0或者 (4) (3)α+(4)β+(2)=(5) (5) Φ2 =Ni i −U = 0 1 dN1 +2 dN2 ++i dNi = 0 [( ln / ) ]d 0 [( ln / ) ]d [( ln / ) ]d 2 2 2 1 1 1 +   +  =   + +  +   + +  + Ni i Ni t t N N t N N       