The Cockpit Voice Recorder in AUTO:
A.A.Always powers the CVR when DC bus 1 is powered.
B.B.Always powers the CVR when DC bus 2 is powered.
C.C.Always powers the CVR when AC Transfer bus 1 is powered.
D.D.Always powers the CVR from first engine start until 5 minutes after last engine shutdown.
正确答案是D