The paper trys to analyse stability of column by the method of dynamic analysis,deduces the formula of relation between axial compressive force and frequency of transverse vibration.

Fatigue life test was carried out on automotive steadied sticks which were made of 28Mn6 steel and thermally treated by bulk induction heating-bulk hardening and continuous induction heating-hardening respectively.

This paper introduced the main factors affecting the drilling machine deviation rate, main way of drilling deviatio and development 106～110mm stable pole driller, and sum up and analysed on the stable pole driller for application and technical and economical benefits in Fankou pb & zn Mines.

For the calculation problem of column stability set forth in this paper,there exists a trouble that the conventional solution cannot satisfy the equation of equilibrium.

The principle,method,frame chart and programme of computer aided design for column stability were put forward.

All-resistant Empedobacter brevis: A Preliminary Study of Its Resistance Mechanism;