According to the experiences in operation,technical reform and maintenance of hydro-turbine governors,discussed are the problems and solutions concerning frequency-survey loop,electric-mechanical conversion parts,feedback of guide blade position and setting of assistant function of hydro-turbine governors.

The strongpoints and developing trend of the sensotronic brake control system on a car MERCEDES-BENZ are introduced here with its main components, working principle and assistant functions.

This paper expounds the special auxiliary functions of the library in constructing and promoting the development of socialist harmonious society t.

Cationic environment-friendly functional agent based on starch derivative was synthesized by introducing ionic functional monomers and macromolecular crosslinking agent into the main chains of the starch.