在选择数据的访问路径时，如果没有正确的列分布统计数据，DB 2可能没有足够的信息来做出最佳的选择，尤其是如果数据出现严重误差。
Without correct column distribution statistics, DB2 may not have enough information to make the best choice when choosing an access path to the data-especially if data is heavily skewed.
叙述了液柱式压力计的精度，对U形管压力计和双管差压计的正确使用方法及误差修正做了简要分析。
The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
通过加工实验，验证了三种刀位计算方法的有效性和误差分析方法的正确性。
The validity of three methods and the correctness of the error calculation were proved in the machining experiments.
大量现场数据的实验证明了该方法的正确性和可行性，它是一种新的表面缺陷误差判别方法。
Experimental data showed the correctness and feasibility of the method. It is a new method for error judgement of surface flaws.
结果表明当目标误差为0．01，径向基函数的分布常数为4时，网络达到最优化，总的正确识别率为96％。
When error goal is 0. 01 and speed constant of radial basis function is 4, the network achieves optimization, and the total correct rate is 96%.
这就给形貌影栅云纹法的测量和处理实验系统带入一个不确定的初始系统误差，它对正确分析实验测试误差带来许多困难。
Accordingly, an uncertain initial system error appears in the measuring system of shadow moire profilometry and makes it difficult to get reliable results in error analysis procedures.
这也证明了应用灰色不确定性来描述误差和公差是正确的。
Therefore, it also proves that it is correct to apply gray uncertainty to describe error and tolerance.
当目标误差为0．01，径向基函数的分布常数为5时，网络达到最优化，总的正确识别率为98％。
When the error goal is 0. 01 and speed constant of radial basis function is 5, and the network achieves the optimization, and the total correct rate is 98%.
本文指出在估计间接测量误差中，学生容易出现的一个问题，并给出正确的方法。
In this essay. we have pointed out a problem in estimating errors in indirect measurement. and have given the right method.
正确使用扫频法测量幅频特性，可以避免大量测量结果中误差的分析与估算。
When frequency sweeping method being used properly for measuring amplitude-frequency characteristics, the analysis and estimation of errors in measurement results could be avoided.
主要介绍了液柱压力计的正确使用方法和误差分析。给出了U 型管压力计和双管差压计的测量精度。
The presentation of usage of liquid column manometer. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
所得的结论对选取正确的展开方法、减小展开误差、提高样板精度很有意义。
The reached conclusion is significant for selecting correct development, decreasing developed error and increasing profile board precision.
通过多个实验表明，试样的均衡性、读数误差控制范围的正确确定以及样本菌量的正确估计，都是影响实验室菌落计数精密度控制的因素。
The results show that homogeneity of samples, correct determine of control range of reading errors and correct estimation of bacterium account are elements that affect accuracy of aerobic plate count.
这也证明了应用区间数学来描述误差和公差是正确的。
Therefore, it also proves that it is correct to apply interval mathematics to describe error and tolerance.
第四章分析了误差的影响因素，以及如何控制误差，并辅以实例图表对误差进行说明，证明了这种方法的有效性和正确性；
In chapter four, the effect factors of error and how to control it are analyzed. Thevalidity and practicality of the method are proved with the example graphs.
用有限元方法分析结构固有频率时，利用这个方法能正确估计由于结构参数的随机性而产生的误差。
Using this method engineers are able to estimate the errors of structural natural frequencies caused by random structural parameters in finite element analysis.
在组建测量系统的过程中，经常需要解决在系统总误差给定的前提下，正确进行误差分配的问题。
In process of organization of measuring system, we often solve the problem of error allocation exactly at the premise of total system error was given.
在反演体积相位全息光栅参量的实验中，反演出的光栅参量与真值的误差不超过1%。证明了该法的正确性和可行性。
In the experiment of determining the Volume Phase Holographic Grating's parameters, the error of the result is not over 1%, so it demonstrates the metrology's validity and feasibility.
但是最大的问题是他们设置的角度，一些小的角度及方向的误差可以导致很多不正确的读数。
But the biggest problem was the Angle that they were set at, a small deviation in the azimuth and direction created a variety of incorrect readings.
同时采用两种不同测量误差的方法还可作为解稳定性和正确性的判据之一。
And the method involving two kinds of different measuring deviation is a good judge on accurate and steady solutions.
同时提出了一种成像系统误差的修正模型，并利用系统辨识方法正确估计了该模型的各参数；
Secondly, a camera system error model is put forward, and all coefficients are computed accurately by using system identification theory, and the test result is reported.
对机械制造中由于工件的测量误差及工艺尺寸的换算而引起的误收和误废进行了分析，做出正确的判断并采取相应的措施进行处理。
The analysis of the product accepted and rejected by mistake caused by the measuring error and the conversion of the technological size chain of the workpiece is carried out.
样机测试结果表明，该装置能对检定规程所要求的时钟日差、当前时刻误差、停车计时误差、扣费正确性项目进行检定。
The testing results of prototype indicate that the verification device can verify the projects, such as Clock Daily Error, Current Hour Error, Parking Timing Error, Charging Correctness.
正确测量机床主轴误差运动是实现加工误差补偿的前提。
To measure rotation error correctly is requisite of realizing error compensation.
钢索张拉顺利完成，最终误差控制在5%以内，证明了施工模拟分析的正确性。
The tensioning of the cables is finished and the error is controlled in 5%, which verifies the correctness of the construction simulation.
本文对试验机因安装、调试不正确引起的示值误差作了较全面阐述，提出了减小误差的方法。
The absolute error caused by the improper installation and adjustment of hydraulicdynamometers is described, and the measures to eliminate the error are suggested.
介绍了补偿器的原理；指出了在实际工作中如何正确使用全站仪以减少竖轴倾斜误差对测量结果的影响。
It introduced the principle of compensator of total station and pointed out how to exactly use a total station to decrease the influence of the vertical axis tilt error.
实验表明，仿真结果与实验值误差不超过5%，从而验证了仿真模型的正确性和有效性。
Testing results indicate that the error between calculated and tested data doesn't exceed 5%. The correctness and validation of the simulation model is demonstrated.
并且通过这些仿真结果和后来实际调测数据的比对，我们总结了一套如何对仿真的误差进行修正的方法，并且通过实验的证明了这些方法是正确而有效的。
Through the comparison between simulation result and debug and measurement, we make a conclusion of simulation error's correction method, which has been proved by measure result.
从理论上得到了被测压力信号脉宽变化时，查准动态压力对照表的误差变化规律，经实验证明该规律是正确的。
The variation regulation of error by consulting the dynamic pressure corresponding table is got theoretically. It has been testified that the regulation is right.
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