n.密碼電話學(xué)

80. Telephone communications which are protected against compromise through use of an approved ciphony system . 通過(guò)使用有效的密碼電話系統(tǒng)，保護(hù)電話通信不被泄漏。

12. Telephone communications which are protected against compromise through use of an approved ciphony system . 通過(guò)使用有效的密碼電話系統(tǒng)，保護(hù)電話通信不被泄漏。

57. Telephone communications which are protected against compromise through use of an approved ciphony system . 通過(guò)使用有效的密碼電話系統(tǒng)，保護(hù)電話通信不被泄漏。

communications which are protected against compromise through use of an approved ciphony system . 通過(guò)使用有效的密碼電話系統(tǒng)，保護(hù)電話通信不被泄漏。