The Three-Gorge Project will produce three major results, namely generating electricity, controlling flood and improving navigation. Owing to the fact that the
After I obtained an MS degree from the US University of Lehigh in 1948.I worked for the Kodak Company for a short time.In the next year. I came back to the moth
This paper introduces the structure and principle of a surface-mount high-precision temperature compensation crystal oscillator,and specifically describes the r