查询词典 rational number

Their chief concern is with efficiency, that is , with implanting the greatest number of children ,with a minimum of time, number of facts into the greatest possible number of children, with a minimum of time expense and effort.

他们的主要的关切是做事要有效率。也就是说，用最短的时间，花费最少量的努力，把最大量的事实移植到尽可能多的孩子们心中。

The average percent value of G C (49.3%) was less than that of A T (50.7%), there was a bias of the content of G, T in the third codon; The number of transition G-A and T-C were 22, 15 respectively, which were higher than that of transition A-G and C-T, the number of tranversion C-A, T-G is 2 respectively, and other tranversion patterns didnt occur; the probability of transition was higher than that of tranversion , Ts/Tv = 9.5-19, there was the highest number of transition in the third codon. The gamma parameter a of the lst,nd and 3rd codon positions were 0.00572,0.01237 and 1.05239 respectively, they showed that there was adifferent substitution rate at different codon position. Frequences of synonymous codon usage were relatively biased. The average rates of synonymous and nonsynonymous substitution were 0.0787, 0.0011 respectively, there was a significant difference between dS and dN (Z = 4.713, p.01), and the low ratio( CD = 0.0284 .3) of dN/dS ratio impled that there were selective constraints against the nonsynonymous sites in cyt-b gene, The distribution of nonsynonymous codon substitution pattern related to Grantharm distance indicated that the purified selection at 2nd codon positions was more intensive than that at 1st codon positions. The phylogenetic trees supported the view of the double origin of Chinese goose, which means that domestic Chinese goose was derived from Anser cygnoides and domestic European goose, and Yili was derived from Anser anser.

碱基含量分析可知，序列的G C含量(49.3％)＜A T含量(50.7％)，密码子第三位点的G、T含量都有较强的偏倚性；序列间G→A和T→C的转换数(22次和15次)高于A→G和C→T的转换数(10次和9次)，C→A、T→G颠换数均为2次，其余颠换模式均未发生；转换数明显高于颠换数，Ts／Tv=9.5～19，密码子第三位点的转换数最高，呈现了相当强烈的转换偏倚性；密码子第一、二和三位点的gamma分布参数α值分别为0.00572、0.01237和1.05239，表明密码子第一位点的替换速率变异最大，第二位点次之，第三位点的替换速率变异相对较小；编码同一氨基酸的同义密码子并非随机使用，表现出一定程度的使用偏倚性；同义替换速率和非同义替换速率分别为0.0787和0.0011，dS与dN值间的差异极显著(Z=4.713，p＜0.01)，而ω=0.0284，明显小于0.3，表明雁属鹅细胞色素b基因序列经历了中度净化选择作用；单步非同义替换(Sing-step nonsymonymous codon substitution，SSNCS)分布模式与Grantharm距离之间的关系说明密码子的三个位点所受的净化选择强度不同；构建的最大简约树与邻接树拓扑结构一致，支持中国家鹅的双起源学说，即除伊犁鹅外的其它中国鹅品种起源于鸿雁，伊犁鹅和欧洲的郎德鹅、莱茵鹅起源于灰雁。

ABSTRACT It is because that the excellent acceptors for maize transgenic engineering are insufficient in our country, especially in the southwest mountain areas of china and hereditary variation regularity for the two characters such as efficiency of embryonic callus induction and number of regenerating plant (these two characters were abbreviated to the nduction efficiency and number of regenerating in the following of the paper, respectively), which hint the maize culturing capacity, is not very clear. Therefore, aiming at picking out superior acceptors, we had made systematic researches on the two characters with combing traditional quantitative-character genetic analyzing methods such as single-factor genetic mating design, diallel crossing genetic design, genetic effect analyzing method and the modern molecular locating method such as QTLs'. The main results are followed.(1) 50 superior inbred lines and about 30 crosses in our country, especially in the southwest of China were used for identifying and selecting the superior genotypes in the above two investigated characters under the same culturing condition in 2000 and 2001. There was very significant difference among the genotypes in the both characters. But the two characters were not certainly related. Some genotypes such as 18-599 and 18-599 were very good in them. For some ones such as zong 31, induction was higher than 18-599 and 18-599 in the efficiency, but it was only 1/3 to the later in regenerating number. In some genotypes such as S37, R08, R15, P138, A318, induction efficiency was just about 3% and scarcely any regenerating plants were got. On the whole, hybrids acted better than inbreeds in the both characters.(2) Two kind of inbreeds were selected as parents of the Griffing's method 1. 18-599 and 18-599 and the inbred line zong 31 are one kind because they are not only superior in the characters of maize cross breeding, such as CA, resistance to disease and the important agricultural characters, but also excellent in transformation characters as the induction and regeneration.

针对我国、特别是西南山地所需玉米转基因工程育种优良受体极为匮乏和反应玉米幼胚培养能力的2个主要性状，即玉米幼胚胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数的遗传变异规律十分不清楚的实际情况，本研究从筛选玉米转基因工程所需要的优良受体入手，采用单因素遗传交配设计、双列杂交遗传交配设计、世代基因效应等传统数量性状分析方法，以及现代分子标记定位主效QTL分析方法，对玉米幼胚胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数等2个性状进行了较为系统的分析研究，取得以下主要研究结果：(1)于2000年和2001年通过对我国、特别是西南地区近50份优良自交系和近30个杂交组合，在相同培养条件下，对幼胚培养胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数等2个幼胚培养能力性状进行了筛选与鉴定，发现玉米不同基因型具有完全不同的幼胚培养胚性愈伤组织诱导率和胚性愈伤组织绿苗发生数，但幼胚培养胚性愈伤组织诱导率与胚性愈伤组织绿苗发生数并不具有必然的相关关系，有的基因型，如自交系18-599和18-599在胚性愈伤组织诱导率和愈伤组织绿苗发生数等2个性状都表现相当优异；有的基因型，如自交系综31，仅幼胚培养胚性愈伤组织诱导率性状表现高于19-599和18-599，但在胚性愈伤组织绿苗发生数这一性状则与它们有相当大的差距，仅为19-599和18-599的1/3左右；有的基因型，如S37、R08、R15、P138、A318等玉米自交系不仅幼胚培养胚性愈伤组织诱导率很低，平均仅在3％左右，而且胚性愈伤组织绿苗发生数表现也很差，基本上没有分化成苗。

The invention discloses a digital good transaction system and the method. It mainly carries on coding process to at least one digital good in a content downloading center into a coded digital good, and the coded digital good will be transmitted to at least one content downloading station with real memory transmission path, when the consumer selects a digital good, the user can uses a content downloading card into a content downloading station, uses a reality transmission path to store the digital good to be purchased, and uses a network transmission wire to connect the content downloading center, the center incriminates the card number in order to generate a card number decoding data, and download the decoding data into a content downloading card, when the consumer want toe buy a digital good, the content can be downloaded into a content card reader, and the reader incriminate the card number to reduces the decoded data and the digital good, in order to generate the digital good which can be read and used.

本发明公开了一种数字商品交易系统及其交易方法，其主要是将至少一数字商品在一内容下载中心进行加密处理以成为一加密数字商品，而加密数字商品将以实际的储存器传递线路以直接送到至少一内容下载点中，当消费者选定一欲购买数字商品时，可持一内容下载卡至其中一内容下载点，利用一实体传输线路直接储存所欲购买的加密数字商品，并藉由一网络传输线路以连接内容下载中心，内容下载中心将根据卡号识别码以产生一卡号解密资料，并将卡号解密资料下载至内容下载卡，当消费者欲使用欲购买数字商品时，即可将内容下载卡置入一内容卡片阅读机中，而内容卡片阅读机将根据卡号识别码以还原卡号解密资料及加密数字商品，以产生可供读取使用的数字商品。

objective to assess the fulfillment of round 3 of global fund aids program in china in order to provide basis for selecting scientific preventive measures and making reasonable work plan.methods to analyze the core programs from reports of round 3 of global fund aids program in 72 counties of 7 provinces in mid part of china,and to assess it by combining specific investigated results.results up to dec 31,2006,fulfilling rate of receiving treatment for occasional infection,and the number of preventing aids patients as well as infected persons was 98.57%.the rate of other index overpassed rearranged objectives.of which,the rate of vct was 111.45%,the rate of receiving anti-virus treatment was 108.42%,the rate of programs activities of government and non-government was 133.83%.at least there was one teacher trained living skills about aids.the fulfilling rate of the number of middle schools of developing living skill education about aids was 125.73%.the fulfilling rate of the number of middle school students educated about living skills was 147.53%.conclusion the fulfillment of objective management of round 3 about aids,especially core index was effective.but there existed the problem that fulfilling rate of some index was too high,which would be corrected in the later phase.

对中国中部7个省72个县实施第三轮全球基金艾滋病项目的完成项目指标报表进行汇总，对其中10个核心项目进行分析。结果截至2006年12月31日，10个核心项目中，除接受机会性感染治疗和预防的艾滋病患者/感染者人数的完成率为98.57%，其他指标完成率均超过了预定目标。其中自愿咨询检测人次数的目标完成率为111.45%；接受抗病毒治疗的艾滋病患者数的目标完成率为121.37%；获得关怀与支持的hiv感染者/艾滋病患者及其家庭数的目标完成率为108.42%；政府部门与非政府机构主动开展的项目活动数的目标完成率为133.83%；至少有一位教师接受过艾滋病生活技能培训，并对中学生开展艾滋病生活技能教育的中学数的目标完成率为125.73%；接受生活技能教育的中学生数目标完成率为147.53%。结论第三轮艾滋病项目的目标管理，特别是核心指标的完成情况取得了比较理想的效果，但存在个别指标完成率过高的问题，将在后续阶段予以纠正。

Show in statistical report of the state of development of the 15th Chinese internet released in Beijing on January 19 , 2005 according to CNNIC , the number of people surfing the Net in the whole country is up to 94 million. A large number of enterprise and individual search for and inquire about enterprise products and service information released on Internet through the network every day, utilize the network to look for a large number of online customer and order , has already become enterprises and popularized fewest investment, the result reciprocates the supreme popularization way.

据中国互联网络信息中心2005年1月19日在北京发布的《第十五次中国互联网络发展状况统计报告》中显示，全国上网的人数达到9400万，每天都有大量的企业和个人通过网络搜索查询在互联网上发布的企业产品和服务信息，利用网络寻找大量的网上客户和订单，已经成为企业推广投资最少，效果回报最高的推广方式。

The letter means the total number of parents, marks the number of parents, which will be recombined, and stands for the number of offspring.

信手段总数的家长，马克的家长人数，这将是重组，并站为后代数量。

This article has studied slowing release N fat to the cotton and the paddy rice growth growth influence, finally indicated: Slowing release N is fat and N fat to the cotton and the paddy rice output and the quality not obvious difference; But compares can obviously enhance the cotton the output, the bell number, the bell heavy gin turnout has the increase, a high increase, the fruit-bearing branch number increases, but to textile fiber quality not tremendous influence;Slowing release N fat fat compares the paddy rice community with N in a big way, stooling strong, Cheng Suilv high, ear of number of seeds many, the output production increase is remarkable; The quality hasthe big enhancement.

研究了缓释型氮肥对棉花和水稻生长发育的影响，结果表明：缓释型氮肥与氮肥对棉花和水稻产量和品质没有明显差异；但较对照能够明显提高棉花的产量，铃数、铃重衣分均有增加，株高增加，果枝数增加，但对纤维品质没有大影响；缓释型氮肥与氮肥较对照水稻群体较大，分蘖力强、成穗率高、穗粒数多，产量增产显著；品质有较大的提高。

During experimental initial stage, whether control or trials, the number of heterotrophic bacteria and vibrios in pond waters increased. After Cefalexin was used again, the number of heterotrophic bacteria and vibrios in all trails' pond waters were obviously lower than that of the control, and the number of heterotrophic bacteria and vibrios in control's pond waters were obviously raised.

在试验初期，无论是对照组还是施用头孢氨苄的各试验组，育苗水体中的总异养菌数量和弧菌数量都呈现出较为明显的上升趋势；在第二次施用头孢氨苄后，各试验组的异养菌总数和弧菌数量的增幅明显低于对照组（或出现异养菌总数和弧菌数量缓慢下降），而对照组异养菌总数和弧菌数量则呈现显著的上升。

When the frequency is 15Hz and number of ampere turns is 20kA·turn, relative intracrytalline solubility of alloy elements (for Zn, Mg and Cu the solubility are 68.8%, 76.0% and 45.0％, respectively) is the highest; when the frequency is 15Hz and number of ampere turns is 20kA·turn, Vicker hardness is the highest of Hv160; when the frequency is 25Hz and number of ampere turns is 20kA·turn, ultimate tensile strength is the highest of 324MPa.

频率为15Hz，安匝数为20kA·turn时， Zn、 Mg和Cu元素相对溶质固溶百分数最高，分别为68.8%、 76.0%和45.0％；频率为15Hz，安匝数为20kA·turn时，锭坯维氏硬度最高为Hv160；频率为25Hz，安匝数为20kA·turn时，抗拉强度最高为324MPa。

The shaping method of noncircular part and the tool holder's radial motion characters in noncircular turning process are discussed in detail in the thesis.

论文详细研究了非圆零件的成型方法和加工过程中刀架的径向运动规律。

I have not really liked him,I do not like his this kind of disposition.

我没有真的喜欢他，我不喜欢他的这种性格。