双

The processing of making birefringence Iceland glassy prism from calcite crystal, which included orientation, cutting, grinding, polishing, coating, testing of extinction index and so on, were described.

介绍了双折射晶体方解石的加工工艺过程，包括对双折射方解石晶体进行定向、切割、研磨、抛光、消光比的测定等。

Some examples are: The dual can also be rendered in a number of ways:· twofold repetition of the ideogram:· twofold repetition of the determinative sign:· a combination of the dual-suffix and repetition of the determinative sign: Vocabulary

一些例子：双还可以提供数种方式：·双重重复字：·双重重复决定性的迹象：·相结合的双后缀和重复决定性的迹象

Outside the clouds existed plates that were 57 cm and 100 cm from ignition point respectively.

气云外布置了平板形障碍物，平板距球心的距离分别为 5 7cm和 1 0 0 cm，平板的布置分为单板、双板垂直、双板平行、3板槽形和 4板口形放置 5种方式。

The results show that the FCCEBMIs with imide structure improve significantly the solubility of bismaleimide in organic solvents without sacrificing thermal properties of cured bismaleimides.

结果表明具有酰亚胺结构的链延长双马能够有效改善双马单体在有机溶剂中的溶解性，而且不降低其固化树脂的热性能。4。

In this paper, the 3D finite element method (3D-FEM) is employed to calculate the responses of the dual-laterolog in the high angle deviated wells. Moreover, under the consideration of the impracticability of the strict 3D inversion of the electrical logging, one method named the fast deconvolution, is given to correct the electrical logs which is calibrated by the forward method, 3D-FEM.

在考虑常规双侧向测井和正演数值模拟计算的基础上，利用三维有限元素法（3D-FEM）进行大斜度井中双侧向测井响应的数值模拟求解，并以不同倾角为条件验证了方法的有效性；进一步针对目前严格的电测井三维反演处理的不现实性，应用严格正演刻度下的快速反褶积处理方法进行定向井的电测井曲线校正。

The impact of parallel operation of wind turbines on power flow is analyzed, in which the squirrel cage induction motors are used as the constant speed wind turbine and the double fed induction motors are used as variable speed wind turbine.

分析了以鼠笼感应电机作为发电机的定速风电机组和以双馈感应电机作为发电机的变速风电机组并网运行对系统潮流的影响，并对不同控制模式下使用双馈感应电机的变速风电机组的电压和无功控制特性进行了比较。

The purpose is to reveal the rules and features of double-push, contribute to a correct understanding of double-push, and seek a more advanced and effort-saving technique for inline skating.

目的是揭示速度轮滑双蹬技术的规律和特征，为正确理解速度轮滑双蹬技术动作原理奠定基础，为寻找更先进和省力的速度轮滑技术提供科学依据。

The purpose of the religious experience is to develop the eyes by which we see this inner flame, and our capacity to live its mystery.

信仰体验的目的就是去培育这样一双眼睛，通过这双眼睛我们可以看到心中那份激情和在这份神奇激情之下散发出的能力。。

At last, the Double Message Signal is proposed and the non-interfere condition is presented that the steering vectors are orthogonal in the weighted inner product space, with the inverse matrix of background covariance as the weighting matrix. The optimal polarization states are designed, according to the EM background.

最后，提出了一种双信息信号传输的方案并导出了无互扰传输的充要条件：两期望信号的信号矢量在以干扰噪声协方差矩阵的逆矩阵为加权矩阵的加权内积空间中正交，在给定的电磁环境下设计了双信息信号的极化状态。

Based on the needs of system control strategy and the output of the active inverter, a switch function method was adopted to build the average model of switch cycle for the active inverter in order to accurately analyze operation characteristic of active inverter, a feed forward and double loop control strategy is put forward, its double control includes a inductor current inner loop control and instantaneous voltage outer loop control.

中文摘要：为准确分析有源逆变器的运行特点，根据系统控制策略的需要，在考虑了有源逆变器输出的基础上采用开关函数法建立了有源逆变器的开关周期平均模型。提出一种前馈加双环控制的控制策略，它的双环控制包括一个电感电流内环控制和一个瞬时电压外环控制。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。