GAPAn.地对空无人驾驶截击机gapn.缺口；裂缝；差距；空白gap gauge for spark plug火花塞间隙表gap between blasting hole炮眼间距gap between rich and poor贫富之间的差距gap - acceptance theory间隙-接受理论gapless superconductivity无隙超导性gap of ground temperature地温差gap in historical records历史记载中的空白点gap among various regions地区差距gap of income distributing收入分配差距gap Diffie-Hellman group间隙Diffie-Hellman群