当通过键控一个调制单音的通断发送识别的归航机，调制度应尽可能保持在接近（ ）。

相关题目

• Single GLS can serves all runway ends and in one airports.（
• The GBAS channel range is restricted to （ ） so that the chan
• The GLS System eliminates need for “critical areas ” required fo
• The GLS System eliminates need for “critical areas ” required fo
• Single GLS can serves all （ ）and in some cases multiple airp