RNP与RNAV的区别在于? The difference between RNP and RNAV is ___.
A.RNP是具有机载性能监视和告警功能的RNAV系统 RNP has the On-Board Performance Monitoring & Alerting (OPMA) system
B.RNP有航路保护区 RNP has the route pretection areas
正确答案是1