有环的

Since the exchange rings with all idempotents central satisfy the general comparability and have stable range1 [100] , this gives a new class of rings for which S K〓(R , is affinely homeomorphic to M〓 BS

若R为正则环，注意到S仿射同胚于P，便立得Goodearl定理[41]；因为所有幂等元中心的exchange环满足一般可比性且有稳定度1，这提供了S仿射同胚于M〓的一类新环。

The IR absorption spectra of PPD was observed at 830~840cm-1, which was assigned to the skeletal vibrations of the phenazine ring. The UV-vis absorption spectra of PPD was at 430nm in dimethyl sulfoxide. Through the analysis of thermogravimetry and derivative thermogravimetry of PPD, the PPD powders char yield at 850 C, which exhibited perfectly stability.

之间有吩嗪环特征吸收峰，说明聚邻苯二胺含有吩嗪环结构；用紫外—可见光谱研究聚合物的吸收峰，发现聚合物在430nm附近有很强的吸收峰；由热重分析发现聚合物在850℃时炭化，所以聚合物有较高的热稳定性。

The piston rings carried in the ring groove are of two basic types: compression rings and oil-control ring.

对活塞环进行的环槽有两种基本类型：压缩环和石油的控制环。

The results showed that the amorphous iron oxide has highly catalytic activity. The intermediate products are pyrocatechin, hydroquinone, benzoquinone and low-grade fatty acid. The mechanism of catalyst oxidation is assumed that the free radical OH attacks benzene cycle at the adjacent position and para-position of OH on phenol so that the benzene cycle is opened and low-grade fatty acid is produced and transformed into CO2 and H2O.

结果表明，非晶铁氧化物催化剂在催化氧化降解苯酚时具有较高的催化活性，苯酚降解的中间产物有：对苯二酚、邻苯二酚、苯醌和低级脂肪酸，其降解机理是羟基自由基攻击苯环上OH的部位或对位而使苯环开环，生成低级脂肪酸，并最终转化成二氧化碳和水，从而使苯酚得以降解。

The benezothiazolocoumarin dyes substituted with chlorine on 5'-position also showed bathochromic shift of the maximum absorption and fluorescence emission.

这9只染料用於涤纶染色有很好的应用性能，差别不大；恶唑环结构和喹唑酮结构的染料耐光牢度明显好於噻唑环结构和咪唑环结构的染料。

The result is that both tin atoms are five-coordination, have a distorted trigonal bipyramidal geometry with an additional week interaction between another oxygen atom and tin atom.

分子中四个羧酸酯基有桥联双齿和单齿两种不同的配位模式；在内环锡和外环锡的配位单元中，锡均形成具有五配位的畸变三角双锥配位构型，同时另有一氧原子与中心锡原子之间有弱相互作用。

As a result, the two beams of light don't have Faraday nonreciprocal phase error.

仿真结果表明，交叉环有很低的轴向磁场灵敏度，与轴向磁场灵敏度为23.4/的普通环相比，其他参数相同、不对称度为1%的交叉二极子光纤环，轴向磁场灵敏度仅为0.23/。

During underbalance drilling gas reservoir is opened gradually,gas is in the shape of spherical from formation into annular flow and bubbles will be inflation migration,so radius of bubbles formation is important for the annular fluid.

欠平衡钻井过程中气层逐渐被打开时，气体将以小气泡的形式从地层进入环空流体中，气泡进入环空后将膨胀运移，变成大气泡，因此气泡生成半径对环空流体的流动规律有重要影响。

The main conclusion is that the sufficient condition of BIBO robust stability for closed-loop system is the unmodelled dynamics and average parameter time-variations component are sufficiently small.

文中著重分析了自适应控制律的特性及闭环系统鲁棒稳定性，得到的结论是：如果未建模动态和平均时变充分小，则闭环系统有界输入、有界输出鲁棒稳定。

A Each protection point to be used during a competition shall be equipped with a quickdraw: an approved and properly closed 8 mm or 10 mm Maillon Rapide complying with IFSC standards (EN standards or international equivalent), to which is attached a continuous, machine sewn sling complying with IFSC standards (EN standards or international equivalent) which in its other end holds the karabiner to which a competitor shall connect the rope.

每一个比赛用的确保点需挂有快扣组。符合IFSC标准（EN标准或国际相关标准）的8或10mm锁环，连接在连续扁带环符合IFSC标准（EN标准或国际相关标准），另一头连接勾环，让选手挂入确保绳。

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％。