They are designed to provide a flight deck display of maintenance information to aid the ground crew ___ troubleshooting and verification testing of the major systems.
A.for
B.in
C.at
D.of
正确答案是B
They are designed to provide a flight deck display of maintenance information to aid the ground crew ___ troubleshooting and verification testing of the major systems.
A.for
B.in
C.at
D.of
正确答案是B