This paper introduces the electrochemistry corrosion technology guided by the reverse engineering theory to controllably reappear high-fidelity superficial texture in a convenient high-effective way.

The author considers that it is necessary to obtain electronic products of high-fidelity for pushing the electronic education on the track of so- cialist market economy, and it may attain the goal by using the automatic adjustment action of nagative feed back.

High signal/noise ratio, high resolution and high fidelity are the objectives seismologists have been seeking for.

And the result proves that the signals have high fidelity by analyzing a sample spectrum.

Synthesize absorbent with high water-retaining property resin(cross-linked AM-co-AA) in two-step way;