This paper describes the hybrid-construction PCB were fabricated by the FR-4 laminate and high performance low-loss prepreg to achieve lower signal crosstalk and permit lower cost.
综述了采用低成本的常规FR - 4层压板芯材和低介电常数高性能的半固化片形成的混合结构印制板，它具有较低的信号串扰和较低的成本。
It was found that the properties of FR steels were significantly better than the plain steel at high temperature.
研究发现，同普通钢相比，耐火钢获得了良好的高温性能。
The appropriate improvement measures taken in braking devices are discussed. The points to which should he paid attention in the course of developing high speed fr...
讨论了在制动装置中所采取的相应改变措施，最后指出我国在研制高速货车转向架时应重视的问题。
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