[ dǐshù ] 1.(事情的原委) the truth or root of a matter; how a matter actually stands 短语和例子 心中有底数 know how the matter stands; feel sure of sth.2.[数学] base number; radix; base
Do you have a minimum quantity requirement for a special order 对于特殊定单，你们有最底数量要求么？
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Role of the phonological loop , visuo - spatial sketch pad in the comparison of the same base powers 语音环路和视空间模板在同底数幂比较过程中的作用
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In a floating - point representation , the numeral that is multiplied by the exponentiated implicit floating - point base to determine the real number represented 浮点表示法中的一个数字，该数字乘上隐式的浮点底数的幂就决定了所表示的实数。
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The beijing police all have publicly showing " the grasping of the basic number of the floating population " as the main goal of carrying out the two special operations of the 3000 police making a door - to - door investigation and the inspection of temporary residence permits of the floating population 3000多片警入户调查、本次流动人口暂住证核查，连续推行的两次专项行动，北京警方均公开表示， “掌握流动人口底数”为主要目的。
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The latter pay special attention to the software implementation environments , including the technical details such as programming interface , data structures and 32 - bits visual c + + inline assembler . a sorftware packet is designed and implemented at last , which can perform the modular multiplication with equal 2048 - bits long of modulu and operands within approximately 5 . 239ms and the modular exponentiation with equal 2048 - bits long of modulu , exponent and base within approximately 4290 . 559ms 经测试，在intelceleron400mhz ， ram64mb的pc机上，进行一次乘数与被乘数的最大位数均为2048位长的模乘运算所需平均时间约为5 . 239ms ，在进行一次底数和指数的最大位数均为2048位长的模指数运算所需的平均时间约为4290 . 559ms 。
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Answer : the purpose that safe evaluation works is from prevent electric industry production is especially big , great , malign with frequency the accident that send a gender sets out , the main and critical factor that exists in environment of safe to equipment system , labor , work and manufacturing management undertakes arguing , understand the base number of safe foundation 答：安全评价工作的目的是从防止电业生产特大、重大、恶性和频发性事故出发，对设备系统、劳动安全、作业环境和生产治理中存在的主要危险因素进行辩论，摸清安全基础的底数。
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On grounds of theory and construction foundation of spatial data framework , watershed spatial frame basic data was confirmed . watershed spatial basic framework was erected , doq being taken as foundation data , utilizing screen digitalization technique to distill main vector lineal element . taking engineering as unit , united spatial base being supplied , vector - grid basic spatial data was managed wholly 根据空间数据基础框架的理论及建立的依据，确定流域空间框架基础数据，以doq为本底数据利用屏幕数字化技术交互式提取主要矢量线型要素，建立流域空间数据基础框架；以工程为单位，在统一空间基底的前提下，对矢量栅格基础空间数据进行一体化管理。
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Taking gis software ( arc / info and arcview ) and visual foxpro as basic plat , protracted the system maps of land resource , those basic subject maps included land use status map , land types map , soil types map , grade map and soil organic substance map , combing with former summarizing research results , built the spatial basic database of land resource ; based the spatial database , by the means of attribute table manipulation and take the map plot as basic unit to get the subject attributes of basic information , combined with social economy attribute information , built the attribute database ; take the spatial basic database as basic work , by the means of vector piles to get the land resource dynamic movement system maps , included land use status , land types and soil organic substance dynamic movement map 以gis软件( arc info 、 arcview )与visualfoxpro为基础平台，绘制完成土地资源的系列图，包括土地利用图、土地类型图、土壤类型图、坡度图、土壤有机质图等基础专题图件，结合以前的工作成果，构筑土地资源的空间本底数据库；通过空间叠加分析，得到基础单元图斑，采用属性表操作的方法获取基础单元图斑的专题属性信息，结合社会经济属性信息，建立属性数据库；以空间本底数据库为基础，采用矢量叠加对比分析的方法，得到土地资源动态变化系列图，包括土地利用、土地类型、土壤有机质等动态变化图。
