以下为句子列表：
英文: Based on the characteristic of the grotto rock reinforced by prestress anchor cable, taking three typical engineering sections in Yulin grotto in Anxi county Gansu province, as examples, the simultating computation for the displacement field and stress fi
中文: 摘要根据锚索加固石窟岩体的特点，以甘肃安西榆林石窟的三个典型的工程段为例，通过动力有限元的方法对地震荷载作用下预应力锚索加固石窟岩体的位移场、应力场的模拟计算，得出了其动态响应和变化规律。
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英文: By altering the length of some structural members while keeping the prestress level above a given lower bound without relaxation, the nodal displacements of prestressed cable structure are controlled.
中文: 在保证预应力索结构各索段一定的预应力水平且不致松弛的情况下，通过改变结构中某些索段的长度，来达到控制节点位移的目的。
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英文: The company has the solid-state induction heating production system which reaching the national most advanced level, and is specialized in producing concrete prestress special purpose steel bars.
中文: 专业生产混凝土预应力专用钢棒，公司拥有国内最先进水平的固态感应加热生产线，占地面积6800平方米，厂房面积8000平方米，专业员工20名。
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英文: The coordinative mechanism of prestress and longitudinal-torsional ultrasonic transducer's output is analyzed through the motion of longitudinal-torsional ultrasonic motor.
中文: 通过对纵扭复合型压电超声马达运行机理的研究，分析了预压力与纵扭复合型压电超声马达纵扭振子输出压电应力协同作用的机理。
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英文: The infuence on resonance frequencies of longitudinal-torsional ultrasonic motor exerted by prestress is studied.
中文: 摘要研究了预压力对超声马达共振频率的影响。
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