A.IU1和IU12對(duì)偶 B.IU3和IU9對(duì)偶 C.IU5和IU6對(duì)偶 D.IUP和IU12對(duì)偶
A.504 B.252 C.378 D.441
A.PQ3 B.ET1 C.PL3 D.PQ1