RVR低于多少米时的运行就被称作是低能见运行?When it is called low visibility operatio
2023-12-01LVO
RVR低于多少米时的运行就被称作是低能见运行?When it is called low visibility operation，the RVR is lower than ?
A.400米。400m
B.500米。500m
C.550米。550m
正确答案是A
