优化器凭借精确的基数估计值来准确计算出每一个待定查询访问计划的成本。
The optimizer is dependent on accurate cardinality estimates to properly compute the cost of each query access plan considered.
优化器凭借精确的基数估计值来准确计算出每一个待定查询访问计划的成本。
The optimizer depends on accurate cardinality estimates to properly compute the cost of each query access plan considered.
这些计算结果都是采用各国的最高可能预算估计值，精确的开支水平并不清楚。
These calculations were made using the highest possible budget estimates for these countries, whose precise spending levels are unknown.
根据已有的分位数统计信息计算出来的过滤因子不是很精确，但即使只收集20个值，其误差仍然低于5%。
The filter factors calculated based on the available quantile statistics are not exact, but the estimate error is below 5%, even when only 20 values are collected.
生命登记系统存在的薄弱环节，尤其是在死产发生最高的地区，使数据的可用性受到限制，同时也阻碍了对精确估值的计算。
Weak vital registration systems, especially in the regions where most stillbirths occur, limit the availability of data and hamper the calculation of precise estimates.
日照切割的几何体依据建筑规范要求对周边建筑最小日照值，经精确几何日照角度计算切割而成。
Its sun-sliced geometry results from required minimum daylight exposures to the surrounding urban fabric prescribed by code and calculated by the precise geometry of sun angles.
电抗是产品要求和设计中的重要参数，电抗计算值必须具有足够的精确度。
The reactance is an important parameter in designing products, whose calculation result must be accurate enough.
通过计算机模拟，得到迭代修正后精确的近场值。
By computer simulation, a fairly accurate correction value can be obtained.
将缩放浮点值十在计算过程中保持精度总是精确的？
Would scaling a float value by ten to preserve precision during a calculation be always precise?
本文给出了在预定精确度下用迭代法计算算术平方根的方法，并分析了迭代的误差，给出了预定精确度下初始值的一个选取范围。
This paper gives a method to calculate the arithmetic square root by iteration with given accuracy, analyses the iteration error and provides a selected range of initial value with the given accuracy.
实际计算结果表明该非线性气动力模型能够较为精确地计算飞机模型大幅值迎角简谐振动产生的气动力响应。
It is shown the nonlinear aerodynamic model given by the article can accurately calculate aerodynamic responses of aircraft models in large amplitude forced oscillation tests at high angles of attack.
运用计算机图像处理技术对金相图像进行二值化处理后，采用图像跟踪算法可使单个晶粒面积的精确求取变得十分容易。
After that the computer image processing technology is used to carry on binary processing for metallographic image, tracking arithmetic makes accurate calculation of individual grain area very easy.
因此，如何精确计算超临界流体在不同操作条件下的密度值，对于超临界流体过程的研究和设计均十分重要。
So, the accurate calculation of the density for SCF is a very important problem with the process design and development at different operating conditions.
在应用裂纹柔度法计算残余应力时，插值函数及其阶数的选择对计算结果的精确性有着较大的影响。
In the evaluation of the residual stress by the crack compliance method, different interpolation functions and their fit order had great effect on the calculation results.
基于特征方程的解，精确地计算出临界载荷参数和动力特征参数的值以及动力失稳模态。
The dynamic buckling modes, the critical load parameter and the dynamic characteristic parameter are calculated accurately on the basis of the solutions of the characteristic equations.
推导出了计算八连杆板冲压力机内、外滑块运动参数的通用公式，其特点是计算值为精确值、计算公式简化和通用性增强等。
In this paper, the authors put forward a set of formulae which can be used to compute accurately motion parameters of both plunger and outer slides of eight-connecting bar plate punching machine.
作者同时发现，“精确法”计算的反应谱值与实际值相比一般是偏小的。
At the same time, it is found that the values of the exact computation method are smaller than the actual values.
计算数据表明，轴向刚度的精确计算与简化计算结果相差较大，而径向刚度的精确计算与简化计算值相差不大。
The results show that the axial rigidity is much difference and the radial rigidity similar between the accurate calculation and the brief calculation.
为了进一步提高螺栓连接设计计算的精确度，本文从强度设计准则、设计规范、基本计算公式等方面作了一些探讨，并着重对以屈服极限为门槛值的强度计算进行了可靠性分析。
In order to improve the accuracy and reliability of bolted joints in design, further investigation on the norm, criterion and basic calculation formulas in strength design are made in this paper.
提出一种计算具有齐次边界条件的旋转薄壳的特征值和特征函数的精确解法。
A new exact solution is developed which enables to determine the free vibration characteristics of toroidal thin shell with homogeneous boundary conditions.
利用这些分析表达式，讨论了束流包络极大值和极小值存在的判别条件，导出了计算包络极大值和极小值及其位置的精确公式。
And we have derived the accurate formulae with which one can calculate the maximum and the minimum values of envelop and their position.
本文推导了计算非线性薄膜对称平板光波导te模截止值的精确公式。
An accurate formula is derived for cutoff values of te modes in the symmetric slab optical waveguide with a nonlinear thin film.
对一台2200KW实际同步电动机阻尼绕组起动温升的计算值同实测结果进行了比较，表明文中提出的方法切实可行，具有较好的工程精确度。
The comparison of calculated damper temperature rises with tested results on a 2200kw synchronous motor shows that the presented computation method has a good engineering accuracy.
整车动力学模型的建立为更加精确的进行车路耦合作用计算提供可能，可以模拟出实际车辆在波形路面激励下产生的动荷载作用值。
The vehicle model provides possibility for more accurate compute and it can simulate the dynamic vehicle loads of real vehicles on wave road.
算例的计算结果与采用精确边界条件的欧拉方程数值解及实验值符合良好，验证了本文方法的正确性。
The results of cases are in good agreement with the Euler solutions using the exact boundary conditions and known experimental data. The correctness of the method in this dissertation is validated.
其中莫尔条纹由CCD采集到计算机中，通过对条纹图像的处理来得到莫尔条纹的精确角度值。
The angle of Moire fringes is obtained by processing on the Moire fringes image, which is captured into computers by CCD camera.
在确定地震工区位置时，用鼠标在计算机屏幕上点出的矩形顶点只是近似值，需要根据这些近似值求出工区矩形顶点的精确值。
When locating the seismic work area, the rectangular vertexes on the computer screen showed only the approximate coordinates from which the accurate figures had to be deduced.
为了减少判断矩阵一致性检验的计算并且增加各因素权重的合理性，对于可以求出精确值的各因素的权重采用计算加权平均。
To reduce the comparison matrix consistency test's calculation and keep the weight of each factor reasonable, that average weight can be calculated by exact value of each factor.
为了减少判断矩阵一致性检验的计算并且增加各因素权重的合理性，对于可以求出精确值的各因素的权重采用计算加权平均。
To reduce the comparison matrix consistency test's calculation and keep the weight of each factor reasonable, that average weight can be calculated by exact value of each factor.
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