【单选题】

The localizer course is aligned with the centerline of the runway, and the glideslope path is at a constant angle to the threshold of the runway.

A、定位器与跑道中心线对齐,下滑道与跑道出口成一定角度。
B、航道与跑道中心线对齐,下滑道与跑道入口成恒定角度。
C、航道与跑道中心线平行,下滑道与跑道出口成恒定角度。