加进一个O Q Q f(61,62) QI Q Qo Q2 If 0-0 f(,61)=1 (60,2) f(O1260)y(On) f(62,60) →f(1,62) f(62b0)((2)加进一个 θ 0 θ 1 θ 0 θ 2 ( ) ( ) 1 0 0 2 20 01 1 2 21 , , QQ QQ ( , ) QQ = f   = = f   f   If θ f (1 , 1 ) = 1 1= θ2 , ( , ) 1 ( , ) 2 0 0 2     f f = ( ) ( ) ( , ) ( , ) ( , ) 21 2 0 1 0 1 2            = = ff f OO Q 1 Q 2 Q 0 Q 0