Fuel onboard is automatically displayed as received from the airplane fuel summation unit and:
A.A.A valid fuel entry is xxx.xx
B.B.Airplane zero fuel weight is not a required entry
C.C.When FMC is not receiving the required fuel data, displayed dashes and manual fuel weight entry is not possible
D.D.Normally the ZFW is entered from the airplane dispatch papers and the FMC calculates the airplane gross weight.
正确答案是D