Vertical Path Parameters (FPA, V/B, V/S) display which of the following parameters related to the present vertical path:
A.A.FPA-actual flight path angle based on flight plan ground speed & vertical spped
B.B.V/B vertical bearing direct from present position of the WPT/ALT line
C.C.V/S-the required vertical speed to fly the displayed FPA
D.D.Blank if there is no entry on the FPA/VS line
正确答案是B