medium frequency radio wave 中频无线电波
Radio-frequency electromagnetic wave 射频电磁波
short wave frequency-hopping radio 短波跳频电台
short wave frequency hopping radio 短波跳频电台
ultrashort wave frequency-hopping radio 超短波跳频电台
This development is made possible by a new wave of technology: radio-frequency ID chips the size of pepper grains, broadband wireless and Web-based "dashboards" enabling monitoring and management.
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