所要求的跑道视程与决断高的关系是?What is the relationship between RVR and DH for

所要求的跑道视程与决断高的关系是?What is the relationship between RVR and DH for CATⅡ requirements?

A.相互独立。independent

B.跑道视程根据决断高进行计算。the RVR is calculated according to DH

C.决断高根据跑道视程进行计算。the DH is calculated according to RVR

正确答案是B