本文给出了一种计算无噪声时具有正弦鉴相器的二阶锁相环捕捉特性的新方法，求得了每个差频周期的平均角频率牵引量。
A new method is presented for analyzing the acquisition behavior of second-order PLL with sinusoidal phase detector in the absence of noise.
论述了一种大型拖拉机牵引式超低量弥雾机的主要性能设计，并介绍其结构和工作原理。
The paper introduced the main functional design of a kind of greater tractor towing ultra small-sized sprayer and structure and working principle.
探讨了直流牵引供电系统馈线保护配置，详细分析了基于电流变化特征量保护的原理。
The paper discussed the DC traction power supply system's feeder protection configuration in the end, and detailed analysis the principle of protection based on the current amount.
介绍了日本为适应电动车组牵引控制系统节能，以及减轻维修工作量的需要而开发的矢量控制、粘着控制等逆变器控制技术。
The inverter control technologies of vector control, adhesion control, etc. developed to adapt to energy saving of EMU traction control system in Japan and to reduce maintenance work are described.
目的： 研究采用牵引成骨技术治疗由于下颌骨骨量不足造成的牙颌面畸形。
The mandibular deformities caused by bone deficiency can be effectively corrected with the technique of distraction osteogenesis.
目的： 研究采用牵引成骨技术治疗由于下颌骨骨量不足造成的牙颌面畸形。
The mandibular deformities caused by bone deficiency can be effectively corrected with the technique of distraction osteogenesis.
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