4、下列哪种关于决断高的定义正确？which of the following is the right definition

4、下列哪种关于决断高的定义正确？which of the following is the right definition of DH?

A.机轮距离跑道标高的高度。wheel to the runway elevation;

B.机腹距离跑道标高的高度。belly to the runway elevation;

C.起落架距离机场标高的高度。landing gear to the runway elevation;

正确答案是A