The CDS MAINT message shows when:A、 the airplane is on the ground and two engines are off.B、the airplane is on the ground or at least one engine is off.C、the airplane is on the ground and at least one engine is off.D、 none of above-易过题库-题库最全的搜题网站

The CDS MAINT message shows when:

A the airplane is on the ground and two engines are off.

Bthe airplane is on the ground or at least one engine is off.