以下为句子列表：
英文: AC square-wave arc welding-its positive and negative half perimeter width can be adjusted and selected the best value SP, It can weld the alloy and alum etc in high quality.
中文: 交流方波氩弧焊，其正负半周宽度可调，可选择最佳SP比值，可高质量焊接铝合金、铝。
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英文: Abstract: By employing the concept of photon flux,the evolution of the phase and photon flux in the eigenmode state in three-wave mixing,and the requirements for the initial phase and photon flux in this state,are studied in the paper.A special state in w
中文: 文摘:利用光子流概念研究了三波混频中本征模状态的相位和光子流的变化，以及该状态对光波的初始相位和初始光子流的要求，研究了三波混频中只有光子流的交换却没有相位变化的特殊状态，提出了本征模状态推拉式非线性光环镜的全光开关，并数值计算了这种全光开关的性能，数值结果表明，该光开关的性能稳定性好，并且易于实现和控制输出信号光的光强及相位.
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英文: Risheng is a high technology company that including scientific research, developing, manufacture, sell and technology support, with many high technology talent here, Risheng can design and develop kinds of sine-wave inversion power supply according to cus
中文: 公司拥有一批长期从事电力电子产品研制开发的高级人才，具有雄厚的开发实力；可按客户要求开发各种功能正弦波逆变器.
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英文: The catch is that property developers are turning the decrepit buildings, abandoned when most businesses fled a crime-wave for the northern suburbs in the early 1990s, into swanky apartment blocks, and property prices have been rocketing.
中文: 上世纪90年代初，多数商业公司因为要远离原所在地的犯罪高潮而搬迁到北郊，吊诡之处在于，房地产开发商将他们遗弃的破楼改造成了时尚公寓街区，而房价也一路上涨。
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英文: The perfectly designed square-wave insures the stableness and concentration of electric arc.
中文: 设计理想的方波电源，确保了电弧的稳定和集中。
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