词汇	频率覆盖区
释义	频率覆盖区 frequency coverage
随便看	secure startup secure state secure steadiness in their position secure steganography secure sth against secure storage Secure storage device secure storage module secure strategy secure subject access Secure Submarine Communication secure submarine communications secure sub-network secure subsystem secure sum secure sum computation secure supplies secure support Secure Survivable Communication Network secure system secure system engineering secure telegraph equipment secure telephone secure telephone system Secure Telephone Systems Program