下列哪一项不属于传统的非精密进近技术？Which of the following is not conventional NP

下列哪一项不属于传统的非精密进近技术？Which of the following is not conventional NPA？

A.快速下降改平。quickly descend and level off

B.CDFA技术。CDFA

C. 梯度下降法。step descend

正确答案是B