穿越高度和下降指示。（）<br>A:Crossing altitude and descent instructions.<br>B:Crossing height and descent instructions.<br>C:Crossing height and down instructions.<br>D:Crossing altitude and down instructions.

穿越高度和下降指示。（）
A:Crossing altitude and descent instructions.
B:Crossing height and descent instructions.
C:Crossing height and down instructions.
D:Crossing altitude and down instructions.

出自：航空情报执照

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