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If R satisfies =0 for any elements x ,y in R then ⑴when k =1, R is commutative;⑵when R has the unity, R is commutative;⑶when R has at least one right regular element and f 2 (t 1,t2) has no terms with degree1 such that Fn= F then R iscommutative when R has at least one right regular element. Here we would like to point out that the above results generalized the results of Fu changlin ,moreover generalized some results of other references . This results enriched the commutative conditions of any ring.

若任取R 中元x， y均有=0 那么⑴k =1时R 为交换环；⑵R 有单位元时R 为交换环；⑶f_2 (t_1，t_2)中t_2的次数不小于k -1且R 中至少有一个右正则元时R 为交换环。

Moreover, similar to the corresponding results in [L8], we will finish the decomposition and semi-simplicity of G-quantum doubles of semilattice graded weak Hopf algebras under the condition of commutativity.

首先，我们通过弱Hopf代数的skew-对来构造了一种新的拟双交叉积，这种skew对是对Takeuchi Hopf代数对的一个推广。

The trick about floating point numbers is that although they are extremely useful for representing real-life quantities, operations on them do not obey the arithmetic rules we learned in middle school: associativity, transitivity, commutativity; moreover, many very ordinary-seeming numbers can be represented only approximately with floating point numbers.

For example：有关浮点数的诀窍是，尽管他们是用来代表我们生活中的数，但操作却不符合我们从中学学到的运算法则：结合律，交换律等等，另外许多时候浮点数只是近似值。

Moreover, the compact space is in existence, which is different from a cut space.

f空间；去掉任意一点以后的子空间是不可约cut空间的cut~*空间是不存在的。

This thesis systematically studies the comparativeness of Chinese trade in services in four aspects of indices basing upon existing achievements by using quantitative analysis method and qualitative analysis method. Moreover, the indices have been compared with those of the five transitional countries in the same timing period. Three points can be drawn from that study. First, the comparativeness of Chinese trade in services are too weak to compete internationally. Secondly, tourism is the only industry that holds its comparative advantage. Finally, we can learn from what the Poland and Hungary have been doing with their trade in services.

本文采用了定量分析与定性分析相结合等研究方法，在前人研究的基础上，对1995-2000年我国服务贸易的国际市场占有率、比较优势指数、显示性比较优势指数和显示性竞争比较优势指数四个指标进行了计算，较全面、系统地分析了我国服务贸易的国际竞争力，并首次将该四项指标结果同一些转轨经济国家的相同指标进行跨国比较，从中得到三点启示：1、我国服务贸易整体不具备竞争优势；2、旅游业是我国服务贸易中具有较强比较优势的行业；3、波兰和匈牙利两国的成功经验对我国发展服务贸易有一定借鉴作用。

Moreover, a series of comparison tests have been done to pursue more comfortable procedure and master characteristics of the filter better. Finally the opinion improving the structure has been set up in order to have access in mass production.

通过对样品的测量进行了系列对比试验，对测量结果进行了分析讨论，一方面是探索方便有效的工艺，一方面是对滤波器的设计进行校验，最后提出了进一步改进结构的建议和实施工艺。

Moreover, rationality and reliability of boom structural design is tested by the comparison of test results and simulation data.

并通过试验结果与仿真结果的比较，检验臂架结构设计的合理性与可靠性。

Moreover, if there is truly a "look", it should be verifiable by an objective blind comparison test.

此外，假如真的存在总体的看法，这也应该通过一种客观的盲测为基础。

Moreover, we successfully use this design method for the compensating the performance of...

对飞行员来说，了解这种性能是很重要的，尤其是在低空飞行的时候。

Moreover, we successfully use this design method for the compensating the performance of plane height dynamic system.

并成功地将这种设计方法用于飞机的高度动态性能补偿。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。