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  must have
     This paper analyses the approach of intensive utilization of land, points out that there must have the standards of intensive utilization of land and evaluation system, the running rule of market body, the encourage mechanism to pursuing intensive utilization of land, and the effective management of government.
     节约用地是提高经济效益的必然要求等方面阐述了新形势下节约用地的重要性 ,分析了节约用地的途径 ,提出了节约用地必须有节地的标准和评价体系 ,必须有市场主体的运行规则 ,必须有市场主体追求节约的激励机制 ,必须有政府的有效管理等相应措施。
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     Enterprises' technological innovation must have strong support of information, and enterprises' management can't do without the support of information.
     企业技术创新必须有强大的信息支持 ,企业管理也离不开信息的支持
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     Implementation of policy must have a good environment.
     政策执行必须有一个良好的环境。
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     A port which is needed to develop container transportation must have deepwater channels and deepwater berths, specially for the key ports planning for container transportation.
     一个港口,要发展集装箱运输,必须有深水航道、深水泊位,尤其是规划成为集装箱运输的枢纽港,更需要深水航道、深水泊位。
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     Like other industrial products, GIS products must have quality management and quality control, which make GIS can offer user quality index while offering its products in the future.
     与其它工业产品一样,GIS产品也必须有质量管理和质量控制,使未来的GIS在向用户提供产品的同时,附带提供该产品的质量指标。
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  there must be
     DDR SDRAM is a high speed and largecapacity memory,but because of the need of synchronous clock and the characteristic that it is controlled by control command,there must be a controller between the system and DDR SDRAM.
     DDR SDRAM是一种大容量,高速度的同步动态存储器,但是由于其对同步性的要求以及需要由控制字来控制的特点使得他与系统之间必须有一个接口来实现时钟同步和对DDR SDRAM进行控制。
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     But the premise condition is that there must be some content and life in your mind.
     但苦思苦想的前提条件是作者腹中必须有东西 ,即思考要有内容 ,要有生活。
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     Its hydration and reaction product are mainly controlled by Ca2+ density, at the same time there must be sufficient moisture.
     其水化反应及产物类型主要由Ca2+浓度控制,同时必须有足够的水分。
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     In order to finish its strategic objective to win the advantage, there must be sufficient human resources in enterprises.
     为了完成自己的战略目标,赢得竞争的优势,就必须有充足人力资源作保证,而要想拥有充足的人力资源,就必须要事先做好细致的人力资源规划工作。
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     Secondly, since there is government inefficiency, there must be perfect financial supervision system, and which should be controlled by laws.
     而政府的金融监管也可能存在失灵的时候,要做到少失灵甚至不失灵,就必须构建一个完善的金融监管体系,同时使金融监管也受到法律的制约,即金融监管的实施必须有法律依据。
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  must have a
     Implementation of policy must have a good environment.
     政策执行必须有一个良好的环境。
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     P2PCW use pure P2P technique, which means no central server to participate in the system, such an construction has many differents to other familiar instant message system such as QQ, MSN etc, who must have a logging server.
     该系统架构采用了纯P2P结构,即系统中没有中央服务器参与,这和常见的必须有登录服务器存在的即时信息传递系统(如QQ、MSN等)等有很大不同。
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     This paper point out the idea that we must have a suitable and comprehensive software management information system to realize software process control base on deeply analyseing the software enterprise information and the background and key technology of the software process information.
     本文在深入分析软件企业信息化和软件过程信息化的现状、研究背景、关键技术的基础上,针对软件客户和软件企业对软件过程能力越来越关注的现状,和目前软件企业普遍存在的软件过程能力低的状况,提出了要提高软件过程能力,必须有相配套的、适用的、完整的软件管理信息系统来实现软件过程控制的思想。
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     Compared with JMS desk-top applications,the JMS Web application calls for a special customer environment:the same message can be consumed by some unknown users,therefore the message receiver must have a "receive but do not confirm" hand-over mechanism.
     JMS面向Web的应用与面向桌面的应用相比,有特殊的用户环境要求:同一个消息必须能被若干未知的用户消费,因此在消息接收方必须有“接收而不确认”的提交机制。
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     The transport of big cities is a multifunctional transport system , especially for the traffic manners of big cities ,they need a diversified and reasonable traffic structure of passenger transport , and must have a great development which accommodate the economic society .
     城市交通是一种多功能的运输体系,特别是大城市的交通方式,本身需要一个多样化的合理客运交通结构,必须有一个适应经济社会的大发展。
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  it must have
     Small and medium-sized enterprise has already become the fresh combatant of China's economy,its development can't be ignored,but it must have enough funds as the guarantee in the course of its development,so its financing problem has received the common concern of the whole society.
     中小企业已成为中国经济发展的生力军,它的发展壮大不可忽视,但在其发展过程中必须有足够的资金作保证,因此其融资问题已受到全社会的共同关注。
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     The law is the most effective to restrict rent-looking of the power, but it must have a suitable environment to sustain.
     制约权力寻租最有效的方法是法律制约,但是法律制约权力寻租还必须有合适的环境为支撑。
短句来源
     To transmit integrated wideband services on HFC it must have the function of advanced network management. But with the developing of HFC technology, there are more and more problems on network management.
     要在HFC上提供综合宽带业务,必须有完善的网络管理,但随着HFC接入网技术的推广和发展,网络管理技术的难度与问题也在不断增加;
短句来源
     And if a city wants to achieve its ecocity development goal, it must have a scientific strategic plan.
     而一个城市要实现生态城市的发展目标,必须有一个科学的战略规划。
短句来源
     In order to make the study group play its important part, it must have a good system of study support services.
     学习小组要想充分发挥作用,必须有强有力的学习支持服务体系作支撑。
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  must have
One outcome is a simple proof that for $g_{m \alpha , n \beta}$ to span $L^2,$ the lattice $(m \alpha , n \beta )$ must have at least unit density.
      
The following principle is well-known in Harmonic Analysis: If a real function has a spectral gap at the origin then it must have many sign changes.
      
Hence, the ore-forming fluids of the Zijinshan subsystem must have been derived mainly from formation water and partly from magmatic water.
      
It was concluded that the donor must have a lower metabolic rate than the recipient when the involvement of structural elements of the graft is required for healing in skin plastic surgery.
      
In contrast, when it is necessary to strongly biologically stimulate the reparative processes of the recipient, the donor must have a higher metabolic rate than the recipient.
      
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  there must be
Then there must be a high-precision control field.
      
This means that there must be an 'optimum' IFSS which induces the highest tensile strength of the composite.
      
Therefore, there must be an international legal response as part of the overall response of the international community to terrorism.
      
Essentially, there must be a reality that exists independently of human consciousness, for consciousness evolved.
      
In religions, this deadlock is used to illustrate the limits of human reasoning powers and, by the same token, to prove that there must be an ultimate reality which can only be accessed through "revelation", "enlightenment", and the like.
      
更多          
  must have a
It was concluded that the donor must have a lower metabolic rate than the recipient when the involvement of structural elements of the graft is required for healing in skin plastic surgery.
      
In contrast, when it is necessary to strongly biologically stimulate the reparative processes of the recipient, the donor must have a higher metabolic rate than the recipient.
      
In porous electrodes with an immobilized enzyme the substrate must have a high specific surface area, which must be accessible to landing onto it a maximum number of enzyme molecules.
      
This model must be suitable for practical applications; i.e., it must have a relatively simple algorithm for obtaining a solution and must ensure an accuracy of the numerical values of the calculated quantities that is acceptable for practice.
      
The matter forming the bridge must have a sufficiently hard and anisotropic equation of state.
      
更多          
  it must have
The following principle is well-known in Harmonic Analysis: If a real function has a spectral gap at the origin then it must have many sign changes.
      
This model must be suitable for practical applications; i.e., it must have a relatively simple algorithm for obtaining a solution and must ensure an accuracy of the numerical values of the calculated quantities that is acceptable for practice.
      
Since in this formula the numeral names are explained by their Babylonian equivalents-and not the other way round-it must have originated in a late period in which the ordinals were already replaced by the Babylonian names.
      
The magnetic field of the Crab Nebula is so large that if the original pre-super nova star had contained it, it must have been on the verge of instability.
      
It must have a value greater than unity in order to obtain a simple dynamical origin of the mass difference.
      
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  其他


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本文用实验结果及理论分析阐明了变压器对电机附雷所起的作用。研究的结果表明:当单相或两相有冲击波袭来时,变压器的作用完全等于一个电感,它不是象很多研究者认为的就是变压器工频漏感,而是等于变压器的高频漏感,后者可能只有前者的四分之一左右。为了保护电机不受雷害,必须使电机母线上具有足够的电容,其值如文中表1所示。此外,本文还证明了星形,星形结线对电机防雷最有利,而且自耦变压器也同样具有防雷作用——经过线卷直接穿过去的波是微不足道的;从而否定了某些研究者认为变压器必须有一个三角结线以及自耦变压器不能防雷的说法。由于1∶1的防雷变压器成本很大,运行中又损耗能量,而它只不过等于一个不大的电感的作用,所以建议不要采用。

ABSTRACT The validity of the Hammett equation was reexamined in this paper with dissociation constants of anilines as well as phenols.It has been found that for eighty selected pKa values of anilines,seventy of phenols,and twenty one of N,N-dimethyl anilines could be correlated linearly with the substituent constants with satisfactory or excellent results.The ? scale was proposed as a parameter for another type of standard reaction series in which the functional group is capable of donating electrons conjugatively...

ABSTRACT The validity of the Hammett equation was reexamined in this paper with dissociation constants of anilines as well as phenols.It has been found that for eighty selected pKa values of anilines,seventy of phenols,and twenty one of N,N-dimethyl anilines could be correlated linearly with the substituent constants with satisfactory or excellent results.The ? scale was proposed as a parameter for another type of standard reaction series in which the functional group is capable of donating electrons conjugatively instead of withdrawing electrons,as is the case with ? in the dissociation of benzoic acids or with ? in aromatic electropbilic substitution.This parameter in combination with a few σ_(I.R.)~- values can likewise be used for measuring the linear free energy relationships in aromatic nucleophilic substitution reactions.A set of relatively complete σ~- values,of which seventy-eight are primary ?,fifty-four secondary and tertiary ?,eight ? eleven ?,seventy-three primary ? and twenty-three secondary and tertiary ?,are presented.However,values of those sub-stituents with formal charges must be accepted with some reservation.This set of σ-values has been shown to have excellent or at least satisfactory correlations with other sets of closely related σ values.This set of objective substituent constants can also be applied to aromatic nucleophilic substitution not any less adequately than that derived by J.Miller right from this very type of reactions.

本文用苯胺和苯酚的离解常数重新检查了Hammett方程式的有效性.发现了八十个选择的苯胺、七十个苯酚和廿一个N,N-二甲苯胺的pK_a值与取代基常数的直线相互关系能达到满意至优良标准(见表4).提出了以σ_((ArNH_3)~+)~-作为另一有推电子(而非拉电子)共轭效应的官能团的标准反应系的参数,并与少数σ_(I.R.)~-合用以衡量芳香亲核取代反应中的直线自由能关系.计算了一套较为完整的σ~-值,其中七十八个为初级值、五十四个为次级和三级值、八个σ_(I.R.)~-、十一个σ(ArHX~-)~-、七十三个初级σ_R~-和二十三个次级和三级σ_R~-.但带正式电荷的取代基常数必须有保留地接受.这一套σ~-值已证明与其他σ值有优良或至少是满意的相互关系.这套客观的取代基常数用之于芳香亲核取代反应不比Miller从该反应系中求出的数值差.

A spatial pattern for aphid population during the cotton seedling stage is in agreement with the negative binomial distribution when the percentage of cotton plants infested by the cotton aphid (Aphis gossypii Glover) is less than 5% and it conforms with the Polya-Eggenberger''s contagious distribution when the rate of infestation reached more than 5%. In view of this, we chose the effective period for chemical control at the stage of 20% of infestation.Since there were some difficulties arising from nonnormality...

A spatial pattern for aphid population during the cotton seedling stage is in agreement with the negative binomial distribution when the percentage of cotton plants infested by the cotton aphid (Aphis gossypii Glover) is less than 5% and it conforms with the Polya-Eggenberger''s contagious distribution when the rate of infestation reached more than 5%. In view of this, we chose the effective period for chemical control at the stage of 20% of infestation.Since there were some difficulties arising from nonnormality of error distribution, unequality of the group variance, and or non-additivity of the various effects, and since the original survey data from this investigation on aphid control were not satisfied with the assumptions for the analysis of variance, they must be transformed logarithmically into new values. This normalizing transformation will improve the accuracy of the test. The logarithmic transformation not only accommodates the experience in agricultural and biological experiments, but also conforms with the three basic assumptions underlying the analysis of variance procedure and the related tests of significance. The three basic assumptions are: (1) the experimental error should be normally distributed, (2) all the treatment groups must have the same error variance; and (3) treatment and environmental effects ought to be additive.When the sequential analysis is used to test the right time for controlling aphids, we suggest to give k=0.4, kp1=0.2 kp0=0.1, α=β=0.05, and to formulate two parallel linear equations for acceptance (am=0.143m - 5.7625) and rejection (rm = 0.143m + 5.7625) in carrying out the control measures. Because of its useful saving of labour and materials, these two equations are referable for practical application.

棉苗期棉蚜群的空间模型,当蚜株率在5%以下时符合负二项分布,蚜株率在5%以上则符合Polya-Eggenberger核心分布,在防治上应消灭于这个点片发生阶段。 根据这种极不均衡的分布型,在防治试验的调查资料应用变量分析时,应将原资料用对数代换后进行,可以得到比较精确的结果,与生产实践经验相符;也符合变量分析主要基本假设: (1)各种试验误差应成常态分布; (2)各次观察误差必须有一共同的变量; (3)处理效应与环境效应应该是可加的。 应用序贯分析检定棉蚜防治适期(蚜害株20%),定k=0.4、kp_1=0.2、kp_0=0.1、α=19=0.05,求出决定防治与否的两条分领域的平行线方程为: a_m=0.143m-5.7625 r_m=0.143m+5.7625它们可供实践中参考运用,以节约人力物力。

 
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