担任121运行飞行机组必需成员的驾驶员，对于机长，在前多少个日历月之内，必须完成熟练检查？ Proficiency checks for Captain who is the flight crew member uder Part 121, shall complete the proficiency checks within __calendar months
A.6
B.12
C.24
正确答案是A
担任121运行飞行机组必需成员的驾驶员，对于机长，在前多少个日历月之内，必须完成熟练检查？ Proficiency checks for Captain who is the flight crew member uder Part 121, shall complete the proficiency checks within __calendar months
A.6
B.12
C.24
正确答案是A