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effective coverage

强调
电子产品 эффективный охват (область)
航空 эффективная зона действия
 英语 词库
effective coverage
航空, 加拿大 The area surrounding a non-directional beacon NDB within which bearings can be obtained with an accuracy sufficient for the nature of the operation concerned
effective coverage
: 2 短语, 2 学科
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