This paper researches the key technology of High Speed PCB Machine based on the current advanced technology and the characteristic of PCB 's mechanical processing.
本文结合目前的先进技术和印刷电路板机械加工的特点对快速PC B机的关键技术进行了研究。
Based on the big-span metro tunnels, the thesis primarily studies the mechanical characteristic, the stability and the construction methods about the big-span tunnels.
本文以大跨度地铁隧道为对象，研究了大跨度隧道结构的力学特性、稳定性和施工方法。
The mechanical characteristic, power losses and allowed torque of the motor were analyzed at two cases of normal and fault-tolerance operation modes.
分析了电动机在双绕组工作与单绕组工作时的机械特性、铜损耗与允许转矩。
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