abbr.當(dāng)且僅當(dāng)(=if and only if)

IFF.

abbr.敵我識(shí)別器(=Identification；Friend or Foe)

Solution: IFF inoperative in OFF mode. 解決：IFF無法操作已關(guān)掉。

ETrue iff the editable state can be left. 如果可編輯的狀態(tài)可以離開返回。

IFF always inoperative in OFF mode. 甚高頻在關(guān)閉模式下當(dāng)然不能用。

Iff you look back, your journey is ended. 如果你向后看，你的旅程已經(jīng)終結(jié)。

It also has 4 IFF antenna dipoles across the top of the bedspring. 在天線頂端還有4組IFF偶極天線。