查询词典 a class of

On this basis, we consider a class of suboptimum detectors for the asynchronous SSMA system whose decision algorithms consists of a linear transformation followed by a set of threshold devices.

在此基础上，针对随机多址扩频通信系统的情况，分别提出了两种线性检测器—最小均方误差检测器和加权最小平方检测器，以及一种非线性检测器—判决反馈检测器，给出了它们的实现原理和方法。

A key problem is: is it true that the supremum of the ratios of the moduli of quadrilaterals equals to the extremal maximal dilatation?In this chapter, firstly, for a class of quasisymmetric homeomorphisms with substantial boundary points, we apply a result of Chen Jixiu etc.

在第二章中，我们首先利用了文[16]的结果，研究了单位圆周上一类具有本质边界点的拟对称同胚，证明了它的极值拟共形延拓的最大伸缩商等于四边形模之比的上确界，改进了文[128]的有关结果。

In practical applications,there is a class of relations in which the value of a tuple at an attribute is a relation.

在实际应用中有这样一类关系数据库，其中数据项在某个属性上的取值本身又是一个关系。

What I want you do in this brief assignment is to reflect upon the theory or theories you select: you might, for example, have a sense of dimension undiscussed in class, and you could articulate this and reflect upon its implications; else, you might want to contrast the way in which two theories treat a certain key notion; else, you might just be struck by some feature or opposition you had not thought of before encountering the theory, and your response would specify this dimension and develop briefly its implications for your reading practice.

在这份简短的作业堙A根据你所挑选的理论方法思考其蕴含：比如说，你可能感觉到课堂讨论中有未触及到的面向，想对此深入阐述并思考它的意义；或者，你想要比较两种理论对某一关键概念的差异处；或者你过去对该理论的某些特点或异议从未深思过，现在却印象深刻，你的论文可对此加以强调，并针对你的阅读行动提出简要的意义。

One after another, the big cities of the interior have eagerly entered the race to urbanize, with many openly brandishing the objective of becoming a "world city" within a few years. But whether judged by its size, its ambition or the scale of transformation, Chongqing, with its 12 million people, remains in a class by itself.

虽然内陆大城市一个接一个的热切的加入导城市化的竞赛中来，而且许对城市还公开宣称其目标是要在数年以内成为一个"世界性"的城市，但无论从城市大小与野心，还是转变的规模，重庆都以它1200万的人口保持在这些城市的 A 级地位。

The power amplifiers,class A and AB,using power backoff scheme are difficult to meet the effiency requirement under the condiction of a high PAR,which cause a huge energy dissipation while producing a lot of heat.

以功率回退设计的A类或AB类功率放大器难以满足在高峰均比条件下的效率要求，造成了能量的巨大浪费，而且导致了严重的基站或直放站热管理问题，影响了系统性能，增加了制作成本。

copper pyruvaldehyde bis（n -methylthiosemicarbazone） complex, or cu-ptsm, belonging to a class of neutral, lipophilic complexes ,is a positron emission tomography radiopharmaceutical that can be used to evaluate blood flow in the heart, brain, and tumors without following any side effect .cu-ptsm has been demonstrated the ability of rapid diffusion into cells.also because it can be synthesized,it is a potential tracer for pet imaging.

作者单位：610041 四川成都，四川大学华西医院核医学科 cu-ptsm是一种中性亲脂性复合物，用于pet显像的放射性药物。由于该制剂很容易扩散到细胞内，因此注射cu-ptsm后可以了解心、脑和肿瘤部位的血流灌注状况，它不伴有副反应的发生，且合成比较容易，所以是一种非常有前途的新型pet显像剂。

As we well known, the relation between the ideal and congruence of ring is one to one. The skew-ring congruence of regular semiring and qusi-regular semiring are characterized by using of a class of special ideals of semirings and a construction method of regulal subdirect product of regular semirings is given by using of a special mapping on semirings is also studied in this paper.

众所周知，环的理想和同余之间是一一对应的，受此启发，本文利用半环的一类特殊理想刻划了正则半环与拟正则半环上的skew-环同余，并利用半环上的一个映射给出了正则半环的正则次直积的一种构造。

There is a class of persons (happily not quite so numerous as formerly) who think it enough if a person assents undoubtingly to what they think true, though he has no knowledge whatever of the grounds of the opinion, and could not make a tenable defence of it against the most superficial objections.

有一类人想，有人对于他们所认为真确的意见只要无怀疑地表示赞同，虽然对于它的根据一无所知，也不能替它在最肤浅的反驳面前作一番守得住的辩护，那也就足够了。

The closed-characteristic expression is proven to be of a A-class entire function and some related propositions are also given. Based on them a series of nathematic deviations are done, which brings an analytic expression between the controller parameters and the cost funtion as well as the restrictions on the optimization problem. In this way the original proposition is concretized for solving.

从系统的传递函数出发，首先证明系统闭环特征函数为A-类整函数的性质并给出其它有关定理，然后进行一系列数学推导，得出了控制器参数与目标函数间的解析关系式及优化的约束条件，由此产生参数优化的具体命题。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。