HUD标准Ⅰ类精密进近的最低天气标准是()

HUD标准Ⅰ类精密进近的最低天气标准是()

A.DH 60m,RVR600m

B.DH 60m,RVR550m

C.DH 45m,RVR450m

D.DH 45m,RVR550m

正确答案是B