The reasons and correct steps of jacking plunging into ground of Jinshan overpass;

Defect analysis of centrifugal casting brass cage and preventive measures;

Factors and preventive measures of ionic membrane bulling;

Reasons of ionic membrane damage and its preventive measures;

Reasons for "barrel scratching" of screw in the high-speed extrusion of PVC-U profiles and the preventive measures;

The preventive measures of one-ventilation and three-prevention and its existing problems and development;

The hazardous nature of dioxins pollution in food and corresponding preventive measures;

Destructive effects of radar by electromagnetic pulse weapon and its protective measures;

The protective measures of computer internet system virus;

This article introduces briefly the hazards resulted from the static discharge during the process of steam usage in petrochemical enterprise,suggests corresponding protective measures based on test and gives the theory to improve the safe operation for the petrochemical enterprise.