An on glide slope indication from a two-bar VASI is _______ .
A.two red light bars
B.two white light bars
C.one white bar over a red one
D.one red bar over a white one
正确答案是D
An on glide slope indication from a two-bar VASI is _______ .
A.two red light bars
B.two white light bars
C.one white bar over a red one
D.one red bar over a white one
正确答案是D