And they found that the protective covering is actually only 6 nanometers thick. That's about a fifteen-thousandth as thick as a sheet of paper.
他们发现，保护敷层实际上只有6纳米厚，大概是一张纸的千分之十五的厚度。
2
A software based frequency tracking algorithm for protective relaying is analyzed thoroughly. in this paper, the availability of this algorithm under the non-noise condition is proved.
全面分析了一种保护用软件频率跟踪算法的性能，论证了在无噪声干扰的情况下该算法的有效性。
3
In this paper, a new technique of protective layer excavation of horizontal foundation was expounded and applied to the construction of Lijiaxia hydropower station.