下列公式中一定成立的是______。A.πA1,A2(σF (E))≡σF (πA1,A2 (E))B.σF (E1×E2)≡σF (E1)×σF (E2)C.σF (E1-E2)≡σF (E1)-σF (E2)D.πA1,A2,B1,B2 (EE)≡πA1,A2 (E)πB1,B2 (E)
A.(A, B, D, C, F, E, I, J, H, G)B.(A, B, D, C, E, F, I, H, G, J)C.(B, F, G, E, A, I, D, C, H, J)D.(B, F, G, J, A, E, D, I, C, H)
A.(C, B, D, A, F, E, I, J, G, H)B.(C, B, D, A, E, F, I, G, J, H)C.(B, A, D, E, F, G, I, J, H, C)D.(B, C, D, A, E, F, I, J, G, H)