主要原因

The results show that the decalescence of catalyst bed affects the process of hydrogen peroxide catalytic decomposition greatly. If the catalyst bed is preheated or made up of materials with low thermal conductivity, that influence can be depressed. At the same time, the response characteristic of catalyst bed and the efficiency of catalytic decomposition can be improved. The low frequency pressure instability of catalyst bed occurs because of the coupling of catalytic decomposition and supplying. The decomposition plane pushes all the way through the catalyst bed during pressure oscillations, causing unreacted liquid hydrogen peroxide to be exhausted from the bed and leading to the appearance of liquid hydrogen peroxide channeling. Consequently, how to prevent or at least limit this channeling is the key to eliminate the pressure instability of catalyst bed. It was found that adding clapboard to the catalyst bed can depress the pressure instability efficiently.

结果表明催化剂床及催化剂的吸热对过氧化氢分解过程影响很大，对催化剂床进行预热或采用热导率低的材料制造催化剂床等措施，可以降低催化剂床壁面吸热对催化分解过程的影响，提高催化剂床的响应特性和催化分解效率；催化剂床的低频不稳定是催化分解过程与供应系统耦合产生的，催化剂床气体界面的波动过程中，液体过氧化氢穿透催化剂床形成过氧化氢液体通道，过氧化氢液体通道的产生和扩大是催化剂床不稳定的主要原因，也是消除催化剂床不稳定的关键，试验中在催化剂床内加入分流板成功地抑制了催化剂床的低频不稳定。

The addition of 20%H〓 resulted in strong stimulation to dechlorination rate.

补充碳源促进脱氯速率主要原因之一是通过提供电子供体—氢气而加速脱氯的进行。

A major reason for meetings in the business organization is problem solving and decision making.

在商业机构中开会的主要原因就是解决问题和决策。

For the inconsistency and paradox between the traditional accounting result of the contribution ratio of export to economic growth and the positive conclusion of the contribution made by export to economic growth, this paper considers that the main reason for this paradox is that, when the contribution ratio to GDP of consumption, investment and export is measured by traditional method, the different effects of import in the gross accounting of GDP and the decomposing calculation of contribution ratio is confounded, then, the principle of matching decomposition of import item in consumption, investment and export is disobeyed, so the real contribution of export to China's economic growth is greatly underestimated.

针对出口对经济增长贡献率的传统测算结果与出口对经济增长实证结论之间的矛盾和悖论，本文认为造成这一悖论的主要原因是传统测算方法在考量消费、投资和出口对GDP的贡献时混淆了进口在GDP总量核算和贡献率分解核算中的不同作用，违背了贡献率核算中的进口项在消费、投资和出口中的匹配分解原则，从而大大低估了出口对中国经济增长的真实贡献。

Are the place to appear decrepitude firstly, it because that mtDNA in these place is more and easy to be damaged.

现在，已经在多种疾病和和衰老过程中发现了mtDNA的突变，而且这种mtDNA构成的改变，可以引起代谢功能的衰变，后者既表现为ATP合成降低，导致细胞以至整个机体生理功能的降低；又表现为自由基等氧化剂的积聚，并成为前者衰变以及全身组织结构衰变的主要原因。

For the scouring and depositing equilibrium stream, the dominating factor resulting in gravel decrescence was stroking, weathering and grinding.

式。对于基本冲淤平衡的河流，卵石沿程细化的主要原因是碰撞破碎、风化和磨损。

Poor performance is the very reason hindering the development of deductive database system.

效率低是阻碍演绎数据库向前发展的一个主要原因。

Based on stress analysis , the forming mechanism of Uneven Horizontal Plastic Strain defect and its relation with production parameters has been researched in details.

从受力分析入手，研究了横折缺陷的产生机理及生产因素与其对应关系，精轧板形不良引起残余应力不均是开卷出现横折的主要原因。

The traditional response is that the current account is the main causal factor , with capital and financial accounts simply reflecting financing of a deficit or investment of funds arising as a result of a surplus .

传统的解释是经常账户是主要原因因素，而资本和金融账户只是单纯地反映出对逆差的融资或者对顺差产生的资本的投资。

China is not the main cause of the American trade deficit.

中国并不是美国贸易逆差的主要原因。

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。