×
单选题
What is VISUAL SEPARATION?
A
Aircraft remain visually apart by ATC personnel or pilots observing them
B
Aircraft remain electronically apart by ATC personnel observing them on radar or pilots observing them on instruments
C
Aircraft remain physically apart by ATC personnel directing them or pilots following predetermined routes
D
Aircraft remain audibly apart by ATC personnel hearing them or pilots hearing other aircraft on radios
答案解析
正确答案：A
