The periodic check is an important means to ensure that the performance of metrology standard equipment is reliable in calibration laboratory.

According to the requirement for reconstructio n of wastewater treatment plant, the design capacity, design criteria, and reconst ruction scheme were discussed, and some suggestions were presented.

Based on the latest revision of the seismic isolation codes of the major seismic countries such as China,the Unite States,Japan,and the European countries,the design criteria,the product standard and maintenance criterion of base isolation in building structures are compared in this paper.

After the analysis on the cause of the disaster and its serious influences,a review about the design criteria of overhead power lines and comparison between the design criteria of transmission lines home and a- board are elaborater.

Some questions that are met frequently in design and different ideas about design criterion are put forward.

The research addresses the identification of the trestle design criterion, selection of appropriate methods for calculating the wind, wave and tide actions at the estuary site, analysis of the vertical bearing capacity of the open-end steel-pipe piles, and evaluation of.

Owing to the deficiency in the design theory and practice, there is an urgent demand to study the design criterion of plan location and longitudinal profile of railway line for both high/medium speed passenger dedicated line transportation and express passenger/low-speed freight transportation.