iff
英 [ɪf]
美 [ɪf]
conj. 当且仅当; 在而且只有在…时
BNC.44369 / COCA.36235
牛津词典
conj.
- 当且仅当；在而且只有在…时
an expression used in mathematics to mean ‘if and only if’
双语例句
- IFF is a leading creator of flavors and fragrances used in a wide variety of consumer products and packaged goods.
国际香料有限公司是世界上香料香精产品研发的先行者和最主要的制造厂商。 - The IFF had not tracked bonus levels before 2007.
国际金融协会没有追踪2007年之前的奖金发放情况。 - AIMS-Airspace Traffic Control Radar Beacon System IFF Mark XII System
空中交通监控雷达信标系统敌我识别标志XII系统 - Small IFF device for single or group soldiers a lane Between the lines of the soldiers
单兵（或兵组）使用的小型敌我识别器一排排士兵间的小通道 - Research on IFF Mode S Burst DPSK Signal Demodulation Arithmetic and FPGA Implementation
敌我识别S模式突发DPSK信号解调算法研究及FPGA实现 - S is wise iff S believes S does not know anything.
是聪明的当且仅当S相信自己不知道一切。 - It is proved that iff is expanding and has the pseudo-orbit tracing property, then it has the limit shadowing property.
证明了若度量空间上的连续满射有伪轨跟踪性且是扩张映射，则它具有极限跟踪性。 - S is wise iff S has extensive factual knowledge about science, history, philosophy, literature, music, etc.
是聪明的当且仅当S具有关于科学、历史、哲学、文学、音乐等等上的广泛的事实知识。 - IFF System and Its ECM Capability Analysis
敌我识别系统及其电子对抗能力分析 - Application of Side Lobe Suppression Technique in Type ⅱ IFF System
旁瓣抑制技术在Ⅱ型敌我识别系统中的应用 - Iff you look back, your journey is ended.
如果你向后看，你的旅程已经终结。 - Algorithm of radar-IFF correlation in back-to-back configuration
雷达与IFF背靠背配置时的关联算法 - Study on Problems in Radar IFF System
对雷达敌我识别系统中若干问题的研究 - Built up various simulation models for the simulation of the IFF systems.
建立了二次雷达系统仿真所需的各种仿真模型； - At the end of this paper, the development trend of future IFF system and the key technology of IFF are also discussed.
本文还对未来敌我识别技术的发展趋势和关键技术作了讨论。 - The working principle and method of IFF systems were analyzed for a certain type of airplane, and particular study was made on how to implement encoding and decoding of the inquiring and responsive signal.
从某型机的实际工程背景出发，对其协同敌我识别系统的工作原理和实现方法进行了研究，特别对询问、应答信号编码和解码的实现方法进行了探索。 - This paper introduces the principle of the MK XII identification friend-or-foe ( IFF) system, expounds its several working modes and performance characteristics, and gives a kind of design to jam it.
介绍了MKXII敌我识别系统的工作原理，阐述了几种工作模式及其性能特点，并且给出了一种对其干扰的方案设想。 - It is proved that a poset is continuous iff the S-limits for P are σ( P) topological determined.
证明了偏序集P是连续偏序集当且仅当S-极限是σ（P）拓扑决定的； - In this paper, the working principle of IFF system is expatiated and its development process is summarized and retrospected. At the same time, new communication methods, such as laser technology and mm-wave technology used in the IFF system, are also analyzed in detail.
本文阐述了IFF系统的工作原理，并对其发展进程做了总结和回顾，同时详细分析了激光技术、毫米波技术等在IFF系统中的应用。 - Research on Microwave IFF System
基于一种嵌入式微控制器的微波敌我识别系统研究 - IFF is one of important application of automatical target recognizing ( ATR) technology.
敌我识别（IFF）是自动目标识别（ATR）技术的重要应用之一。 - Study on the countermeasure against Laser IFF System
对激光敌我识别系统的对抗问题研究 - Development of the IFF System and Its Reveal to Us
敌我识别系统的发展及给我们的启示 - The working principle and coding mode of laser IFF system are analysed. The application of laser countermeasure technology such as intell gence and jamming to the laser IFF system is discussed.
分析了激光敌我识别系统的工作原理和编码方式，探讨了激光对抗在对激光敌我识别系统侦察和干扰中的运用问题。 - A continuous poset has a countable basis iff the measurement topology of it is separable.
连续偏序集有可数基当且仅当其上的测度拓扑是可分的； - The points for attention iff using PE-3 geophones are lis-ted detailedly.
提出了使用PE-3型检波器的注意事项。 - IFF signal is a type of signal by which the station on earth can identify the flying plane.
IFF信号是飞机与地面站之间进行相互识别的一种信号，包括询问和应答两种格式。 - Chapter 4 introduces the formats and pattern recognition flow of IFF signals, and discusses the IFF signals recognition in complex situation.
第四章介绍了IFF信号的格式和模式以别流程，讨论了复杂情况下IFF信号的识别问题。 - IFF is an important part of modern warfare.
敌我识别是现代战争中重要的一环，只有识别到敌方，才能有效的攻击敌方。 - Analyze the uncertainty of the information fusion of the ground-based radar and IFF. Provide a method to describe the uncertainty.
分析在地基雷达和IFF信息融合中存在的不确定性，给出描述这些不确定性的方法。