Introduced a cutting-bending die using on the automatic metal plate machining line,the die structure was simple,working stably and reliably.

Development of a New Spin Cutting Machine;

Structural design of square tube cutting equipment by applying punching technology;

A description is made on a structure and operating principle of the progressive die for grooving and cut-off of junction pole.

In this paper,The reasonable approaches of organic synthesis have been designed to use analytic and examinatorial program by means of corey's concept of synthon and disconnection,in the meantime ,some common synthetic tactics have been suggested.

With the study of battery discharge features in base stations,after the analysis on the disconnection device for step loads classified by voltage and duration, the article believes the setup of this device exists abuse which might be harmful for battery operation and shorten its life time.

japonica clones which had undergone interconnection and disconnection treatments grew in four types of habitats whose overall soil nitrogen levels showed a gradient.