UNTAAn.联合国技术援助局
UNabbr.(=United Nations) 联合国pron.<口>人,事物,家伙,东西
unfavorable geological body不良地质体
unclosed capacitance sensor非闭合电极电容传感器
uncooled infrared detectors非制冷红外探测器
unbypassed cathode resistor未加旁路的阴极电阻
uncharged demolition target未装药的爆破目标
uncontrolled disintegration无约束冰崩
unfailingly loyal/polite一贯地忠心耿耿/彬彬有礼
unbalance ranked set sample非平衡秩集样本