必须的

Multiple technology like local area network database separate operaton, real time data concentration and distribution mechanism, allopatric backup, and optical fiber virtual private network were used.

由此保证了固定无偿献血者的招募，保证了医疗急救用血的供应，为二十世纪末开展的血液集中化检测和医疗用血的检测应用分子生物学技术奠定了必须的基础。

Color of hair on body and richness of tan on head and legs are of prime importance in adult dogs, to which the following color requirements apply: Blue: Is a dark steel-blue, not a silver-blue and not mingled with fawn, bronzy or black hairs.

对成年狗来的身体颜色来说，在头部和腿部引有大量的棕色是很重要的。而下列颜色也是必须的：蓝色：比较深的钢蓝色，不能有银蓝色，也不能混有黄褐色，青铜色或黑色毛发。

Constructing harmonious society must eliminate disharmonic phenomena, rights poverty is the fountain factor that causes disharmony, most disharmony were caused by rights poverty.

摘 要：我们正在构建的和谐社会不仅是消除权利贫困所必须的环境条件，而且它本身也是消除权利贫困的有效措施，这是由和谐社会的基本特征等因素所决定的。

The Chinese operators also are delivering service in a market starved for content, where there is no satellite service and cable TV is provided by thousands of small cable operators, many municipally owned, and none approaching the kind of service taken for granted by cable consumers in the U.S.

中国的IPTV业者们所面临的市场是一个内容匮乏的市场，这个市场里没有什么卫星电视服务，多达两千多个市属的有线电视台在为观众提供有线电视服务，而对美国有线电视台来说一些必须的服务项目这些电视台几乎都不能够提供。

A bird zeroing in on a flag-footed bug perched on a passionflower might see the flutter of red "flags"—the insect's attempt to divert the hunter's bite to nonessential limbs, away from its vital core.

一只鸟瞄准一个标志有脚的小虫栖息在西番莲上可能看见这摆动的红色&标志&—昆虫的企图转移这猎人咬到非必须的四肢，远离它的至关重要的果心。

In his run from the law, he finds a haven and steady jobs through a mysterious woman who eventually gets you caught into the main game plot involving the obligatory alien device and a group of warring factions, the IPEC, the Scavage, the Mayjr, etc.

在逃脱法律制裁的过程中，他通过一位神秘女士找到了一个避难所和一份稳定的工作，而这位女士最终把你带入了主要的游戏情节中去，比如像是必须的外星设备以及IPEC、Scavage、Mayjr等等这些相互混战的派系这样的内容。

The positive production of ER, NGF and ChAT were detected in cirguli cortex, parieta lobe, frontal lobe, piriformis cortex and nucleus amydgaloideus corticalis, hippocampus gyrus fasciolaris, subiculum, CA2 and CA3, and mainly presented in nucleus medial septal, nucleus lateral septal and nucleus of diagonal band vertical division in septal-diagonal band area.

老年大鼠和去卵巢大鼠间脑内ER、NGF和ChAT的表达强度和阳性细胞数目总趋势是显著降低，而补充外源性雌激素可以阻止其下降，表明雌激素可通过ER促进间脑中NGF和ChAT的表达，雌激素对间脑中神经元结构和功能维持是必须的，而且雌激素对间脑神经元的作用与NGF和ChAT的表达是协同和一致的。

Through bulk copolymerization of octamethylcyclotetra siloxane and aminosilan monomer named N-β-aminoethyl-γ-aminopropyl methyl dymethoxysilane, an amino silicon oil was prepared.The comparison of effect of KOH and tetramethyl ammonium hydroxide as catalyst of the reaction with different status filled in was carried through.

本文首先进行了氢氧化钾和四甲基氢氧化铵催化性能和催化剂加入方法的研究，证实氢氧化钾作为催化剂其催化性能受到实际分散程度的显著影响，因此制备催化剂悬浮液是必须的；而KOH本身易于吸收水分和空气中的二氧化碳，同时反应对水分敏感，氢氧化钾实际表现出的催化性能不理想。

This study firstly discover and denounced that hCG is not only an important endocrine hormone in pregnancy, but also an important autocrine hormone for trophocyte and JAR cell. It directly influence cellular proliferation and endocrine function of JAR or trophoblastic cells.

六、本研究首次揭示并提出了hCG不仅是重要的妊娠期内分泌激素，而且对于JAR细胞而言，可能也适合正常妊娠滋养细胞，hCG是重要的自分泌激素，直接影响JAR细胞或滋养细胞的生长增殖与内分泌功能，可能也是必须的在局部产生作用的自分泌激素之一。

Neither scaling (measuring the size of a feature directly from an engineering drawing) nor assumption of a distance or size is permitted , except as follows : Undimensioned drawings , such as loft , printed wiring , templates , and master layouts prepared on stable material , are excluded provided the necessary control dimensions are specified .

无论按比例缩放(直接从工程制图上测量一个形状的大小)还是假定距离与尺寸都是不允许的，下例情况例外：如果必须的关键尺寸已经给定，没有给定尺寸的图纸，比如顶楼楼面，印刷线路板，稳定材料上的图案，可以是例外的。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。