Aircrews who have been temporarily grounded for more than () days due to physical reasons, need to apply for a single physical examination to a medical examination and appraisal agency.
A.20 B.30 C.60 D.90正确答案B
Aircrews who have been temporarily grounded for more than () days due to physical reasons, need to apply for a single physical examination to a medical examination and appraisal agency.
A.20 B.30 C.60 D.90正确答案B
