如果FMGC1的FM部分故障，那么

如果FMGC1的FM部分故障，那么

A.MCDU1上显示INDEPENDENT OPERATION

B.MCDU1上显示OPP FMGC IN PROGRESS

C.MCDU2上显示OPP FMGC IN PROGRESS

D.MCDU2上显示FMS1/FMS2 AC STS DIFF

正确答案是B