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是必要
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  is necessary
     It is necessary to add 1 %~2 % Na 2SO 4in low density eleclrolyte for restraining the formation of lead dendrites.
     为抑制铅枝晶析出 ,在低酸密度电液中添加 1%~ 2 %Na2 SO4 是必要的。
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     It is necessary and beneficial for the engineering practice.
     这对于高质量天线的工程实践是必要和有益的。
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     Conclusion: It is necessary to limit AF B 1 in Chinese Traditional Medicines.
     结论 :制定中药AF B1含量限度是必要
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     For improvement of bus protection, it is necessary to introduce new theory and technology.
     为实现性能更加优良的母线保护,采用一些新理论和新技术来研究母线保护是必要的。
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     Conclusion ①The combined determination of CYFRA21-1,NSE and CEA is necessary for peripheral lung cancer;
     结论①在周围型肺部占位患者中进行CYFRA21-1、NSE、CEA联合检测是必要的;
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  is necessary to
     It is necessary to add 1 %~2 % Na 2SO 4in low density eleclrolyte for restraining the formation of lead dendrites.
     为抑制铅枝晶析出 ,在低酸密度电液中添加 1%~ 2 %Na2 SO4 是必要的。
短句来源
     Conclusion: It is necessary to limit AF B 1 in Chinese Traditional Medicines.
     结论 :制定中药AF B1含量限度是必要
短句来源
     For improvement of bus protection, it is necessary to introduce new theory and technology.
     为实现性能更加优良的母线保护,采用一些新理论和新技术来研究母线保护是必要的。
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     Numerical calculations indicate that, in order to effectively suppress the diffraction modulations of intensity, it is necessary to choose the order n and half-width ws of super-Gaussian apertures (e.g. n=4, ws=0.4mm) properly.
     数值计算说明,为有效抑制光强的衍射调制,适当选取超高斯光阑的阶数n和半宽ws(如n=4,ws=0.4mm)是必要的。
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     CONCLUSIONS It is necessary to take measures to isolate the patients with a lower neutrophil (<1.0×10 9/L) and use antibiotics reasonably.
     结论 对中性粒细胞数 <1 0× 10 9/L的患者进行保护性隔离并合理使用抗生素治疗是必要的措施。
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  “是必要”译为未确定词的双语例句
     The angle noise from the homing radar is the important random factor which has strong impact on the precision, it is essential to model and verify it.
     作用于反舰导弹末制导雷达的角噪声是影响反舰导弹精度的重要随机因素,对其进行建模和校验是必要的。
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     Conclusion: NR2B is essential for the formation of long term memory,reconsolidation of Y-maze memory. The deactivation of NR2B by ifenprodil will impair these courses.
     结论:NR2B对于大鼠Y迷宫长期记忆的形成、记忆再巩固过程是必要的,NR2B的失活将破坏这些过程。
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     【Conclusion】 Use of BSID-Ⅱ in China is practicable and necessary.
     【结论】BSID-Ⅱ量表在我国引进和使用既是可行的,又是必要的。
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     The mechanism and operation mode of knowledge resources sharing in the network environment is the principal and key problem to the construction of digital library and sustainable development of resources sharing, so it is essential to restudy and construct that mechanism and mode.
     网络环境下资源共享的机制与运行模式,是数字图书馆建设与发展的首要问题,也是资源共享可持续发展的关键问题,重新认识和构建资源共享的机制和运行模式是必要的。
     Supply chain management demand high harmony of whole chain members and support each other.
     对于供应链企业营运的成功,供应链环节的相互支持是必要的. 供应链管理需要整个链条上各参与者高度的协调,反过来供应链管理的实施也将影响各个环节的绩效.
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  is necessary
In the spirit of work of Kerman and Sawyer, a condition is given that is necessary and sufficient for the Fourier transform norm inequality
      
It is necessary to modify the structure of digital control systems and develop new control algorithms, which is done in this paper.
      
It is necessary to test for varying dispersion in generalized nonlinear models.
      
It is necessary to select the catalyst with proper Pt loading when the anode of a direct-methanol fuel cell is prepared.
      
Therefore, it is necessary to implement automatic mitigation which can detect worm and drop its packet.
      
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  is necessary to
It is necessary to modify the structure of digital control systems and develop new control algorithms, which is done in this paper.
      
It is necessary to test for varying dispersion in generalized nonlinear models.
      
It is necessary to select the catalyst with proper Pt loading when the anode of a direct-methanol fuel cell is prepared.
      
Therefore, it is necessary to implement automatic mitigation which can detect worm and drop its packet.
      
It is necessary to consider such limit behaviors when we consider the properties of infinite objects in computer science, such as infinite logic programs, the symbolic solutions of infinite polynomial equations.
      
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In ordinary sampled-data control systems the system response to a step input can reach its equilibrium state only within n or more sampling intervals (n is the order of the controlled plant). In this paper multiple-impulses are used, instead of ordinary simple impulses, to speed up the system response. In such sampled data systems the system response to step input can reach its equilibrium state within less than n, even one, sam-pling intervals. Methods of design of such kind of sampled-data systems and their...

In ordinary sampled-data control systems the system response to a step input can reach its equilibrium state only within n or more sampling intervals (n is the order of the controlled plant). In this paper multiple-impulses are used, instead of ordinary simple impulses, to speed up the system response. In such sampled data systems the system response to step input can reach its equilibrium state within less than n, even one, sam-pling intervals. Methods of design of such kind of sampled-data systems and their com-ponents are discussed. In the last part of the paper methods of compensating sampled data systems with dead time elements is also considered.

在通常的脉冲控制系统中,当输入信号是阶跃函数时,系统的过渡过程至少在n个采样周期内才能完全结束(n是控制对象的阶数).文中考虑了采用宽度不等的多拍脉冲代替通常的单拍脉冲以加快系统的过渡过程.在采用多拍脉冲以后,系统的过渡过程可以在少于n个采样周期内,甚至在一个采样周期内完全结束.文中叙述了这种脉冲系统的综合方法,也讨论了系统中有关组成部分——脉冲组成器和校正装置——的构成方案及其参数的计算方法.最后并考虑了由于时滞引起的对系统动态特性有害影响的补偿问题.文中举有例题,对文中各节内容作必要的说明.

In this paper some cases of optimum control are studied when the conditions at the ends of trajectories are constrainted. The boundary conditions of the system of the differential equations (19), (22), etc. are determined; the formulae of functional variation (20) are derived; and the sufficient conditions of optimality and necessary conditions in some cases are proved.

当軌线末端受有条件限制时,将使最优控制系統有关的微分方程的边界条件变得复杂。本文考虑了各种受限情形,提出了确定边界条件的方法,得到泛函改变量公式,討論了控制最优性的充分条件以及在某些情形下的必要条件。

1. This paper deals with the blood-sucking Ceratopogonidae collected fromSzechuan province.2. The female flies. of Lasiohelea taiwana, Culicoides sugimotonis and Culi-coides oxystoma have been studied morphologically in detail. Apart fromTaiwan Province, these species are recorded for the first time in China.3. The proportional length of the antennal segments, the shape of sonsorypore of the maxillary palpus and the distribution of wing spots are thespecific characters for the identification of these species.4....

1. This paper deals with the blood-sucking Ceratopogonidae collected fromSzechuan province.2. The female flies. of Lasiohelea taiwana, Culicoides sugimotonis and Culi-coides oxystoma have been studied morphologically in detail. Apart fromTaiwan Province, these species are recorded for the first time in China.3. The proportional length of the antennal segments, the shape of sonsorypore of the maxillary palpus and the distribution of wing spots are thespecific characters for the identification of these species.4. The blood-sucking habits of these species are quite different Lasioheleataiwana prefers human blood, Culicoides sugimotonis is a domestic fowlfeeder and sometimes also may feed on human blood while Culicoidesoxystoma is a preference for animal blood.

(一)本文所叙述三种蠛蠓,亦称墨蚊,采集地区包括四川省重庆之歌乐山、北碚之缙云山、澄江镇、宜宝及嘉定等地。 (三)三种蠛蠓之学名为Lasiohelea taiwana,Culicoides sugimotonis及Culicoides oxystoma,除台湾已有报告外,国内其他各地尚系首次记录。 (三)本文所记载的蠛蠓均系雌性成虫,其雄虫,蛹及幼虫之生态以及与传播疾病之可能性诸问题,尚有继续研究之必要。 (四)触角、触须、腿肢各节之比长,翅斑之分布及感觉毛开口孔之形状等为蠛蠓分类上之主要特征。 (五)三种蠛蠓之嗜血习性各不同:Lasiohelea taiwana之吸血对象为人类;Culicoides sugimotonis吸血对象为家禽有时亦吸人血;Culicoides oxystoma之吸血对象则为家畜。

 
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