无线电安全信号的英文

• radio safety signal
• radio-safety signal

• 无线电:    radio; wireless
• 安全:    safe; secure; safety; securi ...
• 信号:    signal; semaphore; gun
• 无线电台安全信号:    radio safety signal
• 无线电安全证书:    safe radio telegraph certificate; wireless installation inspection certificate