“null”的概念、定义、翻译、参考文献-科学参考

单词	null
释义	null [nǝl] ^MATHEMATICS Indicating that an object is nonexistent or a quantity is zero. ^NAVIGATION 1. The azimuth or elevation reading on a navigational device indicated by minimum signal output. 2. Any of the nodal points on the radiation patterns of some antennas.
随便看	international fixed public radio communications service International Geophysical Year international gravity formula international henry International Ice Patrol international index numbers international Morse code international nautical mile international ohm International Polar Year international practical temperature scale International Quiet Sun Year international radio silence international rules of the road international signal code international spheroid international standard annealed copper international synoptic code international system of electrical units International System of Units international table British thermal unit international table calorie international telecommunications service international telegraph alphabet International Telegraphic Consultative Committee code 2

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