35.The manual pilot shall be tested at least at interval of _____ when using the auto pilot.
A.once every shift
B.twice every shift
C.once every hour
D.twice every hour
正确答案是A
35.The manual pilot shall be tested at least at interval of _____ when using the auto pilot.
A.once every shift
B.twice every shift
C.once every hour
D.twice every hour
正确答案是A