The analysis method was introduced for micro-Oxygen in nitrogen calibration gases in this paper,at the same time we have definited the suitable analysis conditions and precision.

This paper reviewed the universality technology for calibration gases so that to prove veracity and unity of size of measurement of countrywide calibration gases and comparability of countrywide measure result.

This paper reviewed the methods of gravimetric for sulphur hexafluoride calibration gases and purity analysis and uncertainty combination,at the same time,we obtain the combination is dates of uncertainty based on ISO-6142 and GB / T 5274-1985.

The advice of China's food safety standard system inspired by the CAC food standard system;

Compiling diagrams of standard system for ship navigation safety;

Comparison and Consideration of Standard and Standard System of Household Textiles at Home and Abroad;

The methods for preparation single component and mixed gas were related, as well as the special standard gas preparation method.

For the preparation and applications of low concentration standard gas ,the inside surface of CL2X gas vessel and its piece with coatings were studied.

The importance of using the standard gases in the detection of the flammable gas alarm and their correct use are emphasized.