The unique eccentric gravity-equipoise mechanism and hook-reverse mechanism are adopted in this kind of pumping unit to simplify its structure, average the forces applied to it, make it run steadily and improve its reliability.

Study on Pothook of City Construction Land Increase and Rural Residential Land Decrease;

Production cost is vital to an enterprise,how to control production cost is the most important civic event,the paper introduce the optimal design of setting plate for pothook.

The policy of "pothook" of the decrease in rural residential land and the increase in urban construction land is an important land management measure taken by the state.

The structured designs of triggered hook and corresponding bumper were given.

The paper presents an approach to detect the existence of system call hooks set by Trojan horses based on the locality and determinacy of execution flows,and the analysis of system function call labs in both user and kernel levels,then designs and realizes corresponding prototype.

The implementing processes of vector save and hook control algorithm are illustrated detailedly.

Preventing code injection attack with hook in kernel mode;