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In this paper,the autocorrelation efficients are proved not suitable for testing the efficiency of stock market and then Dickey Fuller test is gived to test the efficiency of weak form of the SSE.Four month daily closed pri...

本文首先指出利用自相关系数进行检验的不合理性，然后给出了DF检验，最后利用1995年7月至10月4个月的每日股票收盘价检验了5种上市公司股票，它们都满足弱有效性

Notice that our efficiency in using Vim is directly proportional to the efficiency of using the keyboard.

注意，我们在使用Vim时的效率是直接与键盘的使用效率成正比的。

Some studies indicate that the industry concentration ratio is too low and the scale of firms is too small which is bad for the improvement of efficiency,but others has the opposite opinions that China steel industry has the characteristic of diseconomy of scale and there is not an obvious relation between efficiency and market structure.

关于市场结构和经济绩效之间的关系，概括起来主要有市场力量假说和效率结构假说。不同的假说意味着不同的政策含义。确定我国钢铁行业规模效率特征和市场结构与企业效率的关系是实施正确产业政策的基础，具有重要意义。

Through the sharpness of double channel within diskless write functions can improve diskless workstations and double transmission efficiency between the server, so as to improve the efficiency of actual use.

通过锐起无盘的双通道回写功能可以双倍提高无盘工作站与服务器之间的传输效率，从而提高实际使用的效率。

Through a special arrangement of baffles in the stripper, the downflow back mixing of oil gases is reduced, and the influence of stripping gas on the separation efficiency is minimized. More than 99% of separation efficiency can still be achieved.

通过汽提器的特殊结构布置，减少了反应后油气的向下返混，并最大限度地降低了汽提对粗旋分离效率的影响，使引入汽提后的分离效率仍可保持在99%以上。

In order to avoid repeating job in the most extent and improve efficiency of design, using the idea of structure parametric design. Based on APDL, the FEA drill chuck model can be easily created by adjust several geometric parametric and the process of FEA is automatically executed.This paper discusses the affections of different parameters for the stress capability of drill chuck. The high efficiency drill chuck strength analysis system can help designer develop new products.

为避免重复工作和提高分析效率，本文结合ANSYS提供的二次开发参数化设计语言APDL，实现了对有限元分析软件ANSYS命令流的调用，解决了通用程序与专业需求之间的矛盾，完成了钻夹头有限元参数化程序分析，对钻夹头的强度性能进行了分析和仿真；模拟钻夹头实际生成过程中的性能测试试验，探讨加工误差引起的不同装配角度等参数对钻夹头强度性能的影响。

The smaller the polarity of molecules is, the larger y is. Compared with the single thin-layer cell, the dual thin-layer flow through cell has a higher collection efficiency and transfer efficiency.

与单薄层流动电解池相比，双薄层流动电解池具有较高的收集效率和转移效率。

Since curly leaf hybrid could be recognized at early stage,and displayedobvious dwarfness,choosing"Zha′ai 76"as paternal parent not only raised thehybrid-selecting efficiency from the pollinated progenies,but also raised thebreeding efficiency of apomctc dwarf roostock of apple.

鉴别宽叶型杂种较难、需时较长(2-3年生时)并需与染色体倍性鉴定法相结合，因其形态变化较小而生长势又与平邑甜茶无融合生殖苗无明显差异；鉴别光叶型杂种因父本染色体组的影响加大而从形态上容易些，但也需过氧化物同工酶法或染色体倍性鉴定法相配合；皱叶型杂种因在苗期刚出1-2片真叶时就表现明显的标志性状、能从叶片形态上准确鉴别出来，毋须染色体倍性鉴定等复杂方法；因皱叶型杂种能早期鉴别，又表现明显的矮生性，因而选用"扎矮76"做父本不仅大大提高了平邑甜茶授粉后代中选择杂种的效率，而且提高了苹果无融合生殖型实生矮砧育种的效率。

They have been utilizing and obtain favourable efficiency of economic and ecologic efficiency.

在我国，随着大规模的经济建设和国土开发，人为活动加于自然环境的干扰将以前所未有的规模进行。

"The United Nations Environment Programme welcomes this effort to raise the bar on energy efficiency", said Rajendra Shende, Head, Ozone Action Branch - UNEP/DTIE,"All companies will want to improve the efficiency of their equipment to save energy costs and to support global commitments to safeguard the climate system by reducing greenhouse gas emissions, improving air quality and protecting the ozone layer".

UNEP/DTIE（联合国环境署巴黎办公室）臭氧层行动部门领导Rajendra Shende说：UNEP非常欢迎这种对于提高能效标准的努力。所有公司都希望提高设备能效来减少能耗，并希望支持全球各国通过减少温室气体排放、改善空气品质及保护臭氧层行动来保护地球气候系统。

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。