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当NDB的1020Hz识别码调幅度值低于( )时,产生码告
分类: 导航专业业务
发布时间: 2023-11-19 23:02
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当NDB的1020Hz识别码调幅度值低于( )时,产生码告
A.A、20%
B.B、40%
C.C、50%
D.D、75%
正确答案是C
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