A.發(fā)件人B.收件人C.主文檔D.數(shù)據(jù)源
A.C(m,n)=f(A(m,n),B(n,m))B.C(m,n)=f(A(n,m),B(n,m))C.C(m,n)=f(A(m,n),B(m,n))D.C(m,n)=f(A(n,m),B(m,n))
A.C(m,n)=f(A(m,n),B)B.C(m,n)=f(A(m,1),B)C.C(m,n)=f(A(n,m),B)D.C(m,n)=f(A(n,1),B)