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We show a matrix A is similar to an orthogonal matrix over a field of characteristic 2 if and only if ( 1 ) the invariant factors of A are symmetic,(2) A has at least an elementary divisor of the form ( x + 1 ) m.

本文利用矩阵方程证明如下两个结果：设F为一个域char=2，在F上矩阵A相似于一个正交矩阵的充要条件为(1)A的不变因子是对称的。(2)A至少有一个形为(X十1)的初等因子。

Hepatitis A vaccination: Indicated for persons with chronic liver disease, those who receive clotting factor concentrates, men who have sex with men, illegal drug users, laboratory workers exposed to hepatitis A virus–infected primates, persons traveling to or working in countries with high or intermediate endemicity of hepatitis A, and those seeking protection from hepatitis A virus infection.

A型肝炎疫苗：适用于慢性肝病患者、接受凝血因子浓缩剂者、男男性行为者、非法药物滥用者、实验室中曝露于A型肝炎病毒感染灵长类样本之工作者、前往A型肝炎高度或中度流行之国家旅行或工作者、寻求免于A型肝炎病毒感染者。

The invention provides a method for achieving priority level for generating sequence of mapping items which are transformed by network address, the method comprises the following method, first, when an address conversion apparatus needs to converse address after the address conversion apparatus receives a data packet, judging whether the items are generated, upwards sending the data packet to a CPU when a mapping item is not generated, step B, judging whether concurrent mapping number exceeds the preset mapping enqueue threshold with the CPU, if exceeds the preset mapping enqueue threshold, and judging whether a Referer field is contained in HTTP data, and recording the Referer field or a GET field according to judgment result, writing in a REF table, and arraying a priority level for each user according to a write sequence, and step C, leading the CPU to generate map in turn according to the priority level in the REF table, and then sending down to a forwarding layer to transfer a data packet.

本发明提供一种对网络地址转换的映射条目生成顺序实现优先级的方法，包括下列步骤：步骤A：当地址转换设备收到数据包后，需要进行地址转换时，判断映射条目是否已经生成，在未生成映射条目时，将数据包上送至CPU；步骤B：CPU判断并发映射数是否超过预定的映射入队门限，如果是，则判断在HTTP数据中是否含有Referer字段，并根据判断结果记录Referer字段或者GET字段，写入REF表中，并将每个用户依照写入顺序排列出优先级；步骤C：CPU依照REF表中的优先级依次生成映射，然后下发到转发层面转发数据包。

In section one, we introduce some background of the topic, in section two we review some basic and recent results about the structure and hierarchies of the computably enumerable degrees which are closely related to our topic- the algebraic structure of the plus cupping Turing degrees, in section three, we outline the basic principles of the priority tree argument, one of the main frameworks and tools of theorem proving in computability theory, and in section four, we prove a new result concerning the algebraic structure of the plus cupping Turing degrees that there exist two computably enumerable degrees a, b such that a, b ? PC, and the join a V b of a and b is high.

度结合为0′。本篇论文分为4个部分：第一部分介绍了这个领域的一些背景知识；第二部分主要回顾了前人在研究可计算枚举度的结构和层谱时所取得的一些基本和最新结果，这些结果与我们的主题—加杯图灵度的代数结构密切相关；在第三部分中，我们概要的描述了优先树方法的基本原理，此方法是可计算性理论中定理证明的一个重要框架和工具；第四部分证明了一个加杯图灵度代数结构的新结果：存在两个可计算枚举度a，b，满足a，b∈PC，而且a和b的并a∨b是一个高度。

The existing points and lines would form a closed geometric shape. If we put the new point Z outside the closed geometric shape at first and later then found that the point Z has neighboring relationship with the existing point A which is inside the closed geometric shape, we could not link point Z and A directly because that would bring line crossing. If we rearrange the point Z into the closed geometric shape, that also would cause a lot of work to do. With the help of Exclave, all problems could be solved easily. We use point X outside the closed geometric shape as the Exclave of the point A. Then the line between point Z and X could demonstrate the neighboring relationship of the point Z and A.

原有的各点和相邻线段往往会形成一个封闭的几何图形，如果我们把新增点 Z 设在原有的封闭几何图形外部，后来又发现该点 Z 和位于封闭几何图形内部的点 A 存在相邻关系，这时不能直接将两点连接因为那将产生交叉，而如果将点 Z 重新设在封闭图形内部也将导致大量的调整工作；此时借助外飞地的概念，可以轻松地解决上述问题，即在封闭几何图形外部设置点 X 作为点 A 的外飞地，两点使用同样的颜色，用点 Z 和点 X 的相邻线段表示点 Z 和点 A 之间的相邻关系。

Itis a great deal of assistment for treatment and prognosis of patients, if we candiagnose hepatic fibrosis in forepart. The aim of this experiment evaluate the dignosisvalue of ultrasound elastic imaging on early hepatic fibrosis.we will supply thefundermental data for reseach henceforth. 2、Materials and Method The number of Wister rats is 30 and weight is 180-220g. 30 Wister rats had beenligated on the right hepatic ducts (include middle lobe、right lobe and caudate lobe) tocause partial cholestatic hepafibrosis factitiously and divided in A, B and C groups. Aand B groups had been ligated on the right hepatic ducts both. The different with Aand B is that the time of A group after ligation on the hepatic ducts is 2 weeks and thetime of B group is 1 week.

将实验动物分为A、B、C三组，A组为结扎大鼠右侧胆管(包括中叶、右叶、尾状叶)2周后进行检查。B组为结扎大鼠右侧胆管1周后进行检查，C组行假手术为对照组。A组大鼠麻醉后，腹部备皮，皮肤常规消毒，腹部横行切开，暴露肝脏、胆总管，游离右侧胆管，结扎，然后关腹；C组，仅开腹然后关腹，即假手术组。A、C两组同批实施手术，A、C两组术后1周，B组实施手术，步骤、方法、部位同A组。

Itis a great deal of assistment for treatment and prognosis of patients, if we candiagnose hepatic fibrosis in forepart. The aim of this experiment evaluate the dignosisvalue of ultrasound elastic imaging on early hepatic fibrosis.we will supply thefundermental data for reseach henceforth. 2、Materials and MethodThe number of Wister rats is 30 and weight is 180-220g. 30 Wister rats had beenligated on the right hepatic ducts (include middle lobe、right lobe and caudate lobe) tocause partial cholestatic hepafibrosis factitiously and divided in A, B and C groups. Aand B groups had been ligated on the right hepatic ducts both. The different with Aand B is that the time of A group after ligation on the hepatic ducts is 2 weeks and thetime of B group is 1 week.

将实验动物分为A、B、C三组，A组为结扎大鼠右侧胆管(包括中叶、右叶、尾状叶)2周后进行检查。B组为结扎大鼠右侧胆管1周后进行检查，C组行假手术为对照组。A组大鼠麻醉后，腹部备皮，皮肤常规消毒，腹部横行切开，暴露肝脏、胆总管，游离右侧胆管，结扎，然后关腹；C组，仅开腹然后关腹，即假手术组。A、C两组同批实施手术，A、C两组术后1周，B组实施手术，步骤、方法、部位同A组。

Those persons who wish to gain a clear idea of the battle of Waterloo have only to place, mentally, on the ground, a capital A. The left limb of the A is the road to Nivelles, the right limb is the road to Genappe, the tie of the A is the hollow road to Ohain from Braine-l'Alleud.

希望清楚地了解滑铁卢战争的人，只须在想象中把一个大写的A字写在地上。A字的左边一划是尼维尔公路，右边一划是热纳普公路，A字中间的横线是从奥安到布兰拉勒的一条凹路。A字的顶是圣约翰山，威灵顿所在的地方；左下端是乌古蒙，雷耶和热罗姆·波拿巴①所在的地方；右下端是佳盟，拿破仑所在的地方。

Global resin series: Then, infusion of A, B plastic, acrylic Green Red A, B plastic Series: Full transparency A, B series, with globoid plastic infusion series, latex import puzzle series and decorative Wan Nengjiao series, Poly White latex series of vinyl acetate, glass gems, crystal stone, stainless steel dedicated groups of plastic, POLY resin, silicone molds and a variety of industrial plastic.

环球树脂系列：接着、灌注型A、B胶，压克力青红A、B胶系列：全透明A、B系列，灌注用弧面胶系列，进口拼板乳胶系列和装饰万能胶系列，聚醋酸乙烯白乳胶系列，玻璃宝石、水晶石、不锈钢专用无影胶，POLY树脂、模具硅胶及各种工业有胶。

Martial Godet think, A-share market's performance exceeded all expectations, the recent global market volatility larger, since the general market after a sharp decline in general there will be a reaction to a certain extent, with the exception of A-share market down a unilateral posture, and the size of non-A shares unilateralism should be down the most fundamental incentives.

武术戈代认为，A股市场的表现超出了一般后，在所有有大幅下降的预期，近期全球市场波动较大，因为一般的市场，将在一定程度上反应，在阿单方面的姿态下跌股市场的异常，以及大小非A股单边下跌应该是最根本的诱因。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失