无误差

Hence, the empirical productivity formulas for the gas wells of relatively homogenous and aeolotropic gas reservoirs were established with the "single point testing" method respectively.

但由于忽视了单点经验产能公式的适用范围和测试条件，计算的无阻流量与修正等时试井相比，部分气井误差达 30 %以上。

There are no distinct differences between ancestral character state and descendant character state in some characters. 4. Only one outgroup can't give enough information to tell what the ancestor looks like. It make us not to understand how a lot of charactors evolved. 5. The matsutake group is polyphyletic. 6. The character coding is not precise enough. 7. Some characters are not homology. The result of molecular systematic study on the matstuake group shows the group is not monophyletic. The matsutake group is more closed to Tricholoma than Armillaria. ITS sequence of Catathelasma ventricosum is nearly identical to that of the matsutake group, although apparently they are very different from each other in morphological characters.

对松口蘑群通过形态学特征进行系统发育关系分析造成很大的干扰的原因有：松口蘑的种类大多形态特征比较简单，可提供进行分析的特征不多；某些性状在一些状态之间的反复转化，造成分析上的误差；在进化过程中某些性状无明显的祖征和衍征，在分析过程中很难确定进化极性；选择外群时应该用一个特定类群进行整体理解后，确定各个性状的极性，不要只用单种作为外群；松口蘑群是一个多系群；进行比较的性状不一定是同源的；数量性状编码过于粗放，反映不出真实的情况。

On the other hand, the dynamics in the mean motion resonances in the main asteroidal belt (the Kirkwood gaps and also accumulations of asteroids in definite region) is still not well understood.

而我们之所以选择映射方法是因为映射方法与解析计算和直接数值积分相比，有着速度快、无积累误差、理论分析简单等优点，适于研究动力系统的长期演化问题。

In addition, error resource existing in rotor position estimation algorithm is analyzed comprehensibly, therefore, some further work is made to eliminate the negative influence from errors. In this research, additional function is added to rotor position estimation algorithm to enhance precision of position estimation and its feasibility has been proved.

根据已有的无位置传感器转子位置检测原理，提出了两种改进的检测方法：一是改进电感法的检测方法，并设计了检测电路；二是根据SR电机的ψ-I-θ关系，研究了基于模糊推理规则的间接转子位置估算方法，分析了估算过程中存在的误差源，研究了提高估算精度的策略。

A method of calibrating the sensors' position error, channel gain and phase uncertainties of equispaced linear array without phase delay ambiguity was presented.

针对等距线性阵列天线的阵元位置误差和通道幅度相位不一致性问题，提出了一种采用单校正源分时多方位的无相位延迟模糊校正方法。

Those are measured and calculated by computer such as voltage, current, frequency, active power, reactive power and power factor. The errorless of three-phase voltage and current is less than 0.5 percent.

用微机实现对电网电压、电流、频率、有功功率、无功功率、功率因数的测量和计算；计算高压配电线路得出的三相电压、三相电流有效值误差小于0.5％。

Result and Discussion: Participant with shoulder pain had significantly decreased acuity than that in participant without shoulder pain, especially internal rotation and horizontal abduction in glenohumeral joint.

结果与讨论：结果显示肩痛者比无肩痛者在肩胛胸廓、肩盂、以及胸锁三个关节都有著较高的三维变异误差，代表受伤组织使得肩部各关节在整体动作中的准确性皆下降，尤其在肩盂关节两者的差异最大。

For lensless magnification mode, the subtraction method was presented to eliminate the system total aberration to get the 3D phase information of the phase gating by using Fresnel approximation approach and the convolution approach, respectively.

在无透镜放大数字显微全息系统中，分别利用菲涅耳近似法和卷积方法再现原始物波前，并提出相减法消除系统主要球面误差，获得相位光栅的深度信息。

The mass fraction of Fe2O3 in the mixture was calculated and used as a representation of mixedness degree. The results of the study show that the new method provides similar precision and accuracy for...

结果表明，该法与重铬酸钾法比较，精密度和准确度均无显著性差异，测定混匀度的相对误差在±2%，且方法简便、快速、准确、对环境友好，可用于生产实时监控。

During the period of two theodolites taking part in real-time intersection calculation, the nonplanar intersection method is the special case of this method, so this intersection method is very effective.

仿真试验结果表明，与异面交会法相比，此方法产生的引导数据平滑、无波动，二者的定位误差均小于0.18m，能满足电视经纬仪多站交会定位的要求。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了