等环的

In this paper we mainly study some important classes of idempotent semirings. First, we give certain characterizations of the members of them from all kinds of angles; second, we obtain the subdirect product decomposition of some semirings which are members of them.

本文主要研究了几个重要的幂等元半环簇，从多个角度给出了其中成员的刻划，也对他们进行了次直积分解。

The numerical calculation and influencing factors of casing well resistivity logging are studied.The response equation of resistivity logging is established based on the electromagnetic field theory and the distribution characteristics of the electric field in the intermediate zone.

根据电磁场理论和中场区电场分布特点，建立套管井地层电阻率测井测井响应方程，用传输线理论分析了套管井测井数值计算的可行性，分析了水泥环、地层电阻率、套管厚度等因素对测井响应的影响。

The following statement are the main results:Theorem 2.2.14 Let R be a reduced left morphic ring, then every left ideal of R is generated by a central idempotent. Hence every left ideal of R is also an ideal.

主要结果：定理2.2.14：设R是约化的左morphic环，则R的每一个左理想L都由中心幂等元生成，因而L也是理想。

A pilot vehicle system mathematical model containing nonlinear control elements of the flight control system is established by the describing function method; the limit cycle of PVS is determined; the relation between the limit cycle and pilot induced oscillation and the influence of nonlinear control elements on PIO are explored.

采用描述函数法建立了含有非线性控制系统的人机系统数学模型，确定了系统的极限特性，探讨了极限环与驾驶员诱发振荡之间关系和操纵系统非线性因素对PIO影响等。

LVI lube base oil with low pour point,high viscosity and good stability can be produced by means of hydrogenation acid removal,furfural treatment and hydrotreatment .

克拉玛依油田九区稠油是典型的环烷基原油，采用加氢脱酸、糠醛精制、加氢处理等精制工艺能生产出倾点低、粘度大、安定性好的LVI润滑油基础油。

In the past ten years, studies have revealed that CRISPs were also widely distributed in venoms of some reptile and mollusc and could block Ca(superscript 2+), K(superscript +) and cyclic nucleotide-gated ion channels.

近十几年来的研究发现，CRISPs还广泛存在于一些爬行动物、软体动物的毒液中，有钾、钙离子通道和环核苷酸门控通道阻断活性及前体加工酶等活性。

In the past ten years,studies have revealed that CRISPs were also widely distributed in venoms of some reptile and mollusc and could block Ca2+,K+ and cyclic nucleotide-gated ion channels.

近十几年来的研究发现，CRISPs还广泛存在于一些爬行动物、软体动物的毒液中，有钾、钙离子通道和环核苷酸门控通道阻断活性及前体加工酶等活性。

In addition,the one complex containing benzoaza-15-crown-5 pendant has a relatively higher catalytic activity over another one containing morpholine,which may be due to the preponderant effect of hydrophobic environment of the former.

Schiff碱类金属配合物除在氢化反应、环氧化反应、聚合反应、仿生催化氧化等方面得到广泛的应用外[5]，近两年来，我们发现Schiff碱金属配合物也能有效地促进酯的水解或剪切4

We are the agency of Swiss SEFAR Group,which manufactures monofilament or multifilament fabrics with polyester,nylon,polypropylene,PTEF and needlefelt mainly used in chemical,pharmaceutical,dyestuff,minig,food,disc filter,plan filter etc,we also supply other certain filter media and technical service.

简介： 正中公司专业代理瑞士SEFAR筛网滤布编织公司所织造的聚酯和尼龙聚丙烯聚四氟乙烯等各种合成纤维单，复丝滤布及无纺布，应用于化工，制药，染料，矿业，食品，造纸，环各行业过滤设备上，正中公司并提供其他相关的过滤介质及技术服务。

Tatsu varieties is the production and operation of 12 major categories of more than 50 varieties, mainly for rubber-filled Products oil, aromatic oil, paraffin oil, naphthene oil series Products, Product, respectively, applied to natural rubber, styrene-butadiene rubber products, butadiene rubber, EPDM ethylene-propylene rubber and the oil-filled elastomer SBS and footwear industries in the TPR pellet production, and also applies to styrene-butadiene rubber, chloroprene rubber and processing of oil-filled, annual production capacity of 15,000 tons.

现生产经营品种达12大类50多个品种，主要产品为橡胶填充油、芳烃油、石蜡油、环烷油等系列产品，产品分别适用于天然橡胶制品、丁苯橡胶制品、，顺丁橡胶制品、三元乙丙橡胶乙丙橡胶及弹性体SBS的充油和制鞋工业中的TPR粒料生产，也适用于丁苯橡胶、氯丁橡胶充油及加工，年生产能力达15000吨。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。