Based on an analysis of the relative shaft-to-hole position and attiude errors, as well as of the mechanics and Kinematics in the process of automatic assembly of industrial robots, the paper studies the principle of construction of dynamic wrists.

They are most likely caused by irregular movements in playing badminton and tend to appear in the wrists and the shoulder joints.

As far as the basic piano playing skills are concerned,the following points should be paid attention to: the support from fingers to palms will affect the quality of sound produced;wrists are the key parts which not only connect lower arms to fingers,but also function as an adjustor;elbows act as media in piano playing;and in addition,the use of the natural weight of arms is of extreme importance.

Cluing with the production process,measures of lightning and static electricity protection for every production chain and checking attentions in coking plant are introduced.

Common antistatic agents are easily fled from the film during photographic processing,a grafting copolymerization process of polymers containing sulfonyl,carboxyl and hydroxyl groups can be used to overcome this imperfection,by transforming them into permanent antistatic agents.

S electiono f antistatic agents (electric conductive materials) and their application quantity, determination of optimum technological conditions and quality level of product for manufacturing a specific kind of antistatic particleboard are summarized.

This paper summarizes an achievement on the research of high polymer antistatic agent used for manufacturing photographic materials, and outlines its technical background, production method, technological process, raw materials specificatioes and physico-chemical properties of the finacl product.