下列哪种进近不适用CDFA技术？which of the following is not suitable for CDFA？
A.目视盘旋进近。visual circling approach
B.VOR进近。VOR approach
C.NDB进近。NDB approach
正确答案是A
下列哪种进近不适用CDFA技术？which of the following is not suitable for CDFA？
A.目视盘旋进近。visual circling approach
B.VOR进近。VOR approach
C.NDB进近。NDB approach
正确答案是A