Objective To evaluate the mechanical properties of four kinds of orthodontic rubber elastics through static testing under air, water and saliva conditions, and to evaluate their biologic (cytotoxic) properties.

Transform of power brake system of wire rope traction belt-conveyor;

Study of the Therapeutic Effect of Different Cervical Vertebra Traction Strap on Cervical Spondylosis of Arteriae Vertebralis Type;

De-epithelialized corium flaps supporting and continual traction for correction of serious nipple inversion;

Influence of draw rate on PP/PA6 in-situ composite;

Methods Review and analyze 375 cases in this series treated with the united three ways(massage by hand,many directions drawn by computer program-controlled and dehydration therapy) of the hernition of lumbar disc.

In this article,the author introduces some installation technologies of integral steel box girders,such as applying simple equipment to draw across the bridge piers with a winch,and using lifting device to dropped girders into place,which is applicable in practice to installation of structure in large size.

Steel rope drawing the motor-driven door of railway junction;

By analysing the control system and drawing process of SS3 electrical locomotive,the mathematical model has been set up in the form of system transfer function.

Conclusion Medicine,drawing,TDP treats protrusion of the intervertebral disc of the waist is a safe,effective method.