以下为句子列表：
英文: A class of exact solutions of the Dirac equation are obtained for an electron in the electromagnetic field of a wave guide formed by two pairs of hyperbolic cylinders.
中文: 摘要研究了位于由两对双曲柱面构成的波导管电磁场里的单电子的性质，得到了单电子在场中狄拉克方程的新一类精确解；计算了极化算符的本征函数。
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英文: Abstract: Based on the wave equation, this paper describes the underwater acoustic propagation by a wave guide model,and computes the model.
中文: 文摘:通过求解波动方程建立了水声在波导中传播的模型并进行了仿真计算。
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英文: Based on the characteristics of hollow wave guide for CO2 laser delivery, a cone-shaped wave guide coupler system was designed and fabricated in this work.
中文: 摘要针对CO2激光传输用空芯波导的特点，设计、制备了锥形空芯波导耦合器系统。
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英文: Delivery performance test shows that this wave guide coupler system may help much in improving the transmitting property of CO2 laser hollow wave guide.
中文: 对此耦合系统的传输性能测试表明，使用该锥形空芯波导耦合器能够显著提高空芯波导的激光传输性能。
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英文: Litton Precision Products Inc. NL deals among other things in Electro-technology, Direct current motors as well as in Wave guide components, Precision technology and also in Slip-rings.
中文: NL是一家现代化的、可靠的产品供应商，这家供应商从事电工学、电工技术,直流电动机,波导管构件,精密技术的制造、销售。请您访问我们的主页或者发送给我们电子邮件，垂询当前的信息和服务。
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