This paper combines the two-step preprocessing method based on the characteristic spectrum with the multi-resolution preprocessing method to rapidly analyze the electromagnetic scattering problems.

The article introduces the pretreatment technology of vegetable oil wastewater,and gives analysis to sutable uses.

Furthermore, some suggestions on domestic research and development of pretreatment technology have been given.

The development and advance of short fiber pretreatment technology were described from the surface pretreatment agents and pretreatment methods of the short fiber The technologies of in-situ formation of short fiber by reaction processing and direct adhesion between short fiber and rubber were also introduced.

Fracturing pre-treatment technology for exploration well;

Membrane fouling of micro-filtration and ultra-filtration leading to flux decline in wastewater treatment can be attenuated by appropriate pretreatment.