Aircrews who have been grounded for more than () days need to reapply for medical examination and appraisal and obtain a medical certificate before resuming flight
A.30 B.60 C.90 D.120正确答案C
Aircrews who have been grounded for more than () days need to reapply for medical examination and appraisal and obtain a medical certificate before resuming flight
A.30 B.60 C.90 D.120正确答案C
