This standard specifies the basic principles and safety technical requirements for filling of compressed gas cylinders.
This standard is applicable to the filling of compressed gas cylinders.
This standard is not applicable to the filling of gas mixture(except CNG) cylinders and CNG cylinders service for vehicles.
定价: 312元 / 折扣价: 266 元 加购物车
This document specifies the basic technical indicators and technical requirements for the establishment and maintenance of the geodetic control network,the vertical control network and the gravity control network,the quasi-geoid determination,so as to realize the nationwide unified geodetic datum,vertical datum and corresponding sounding datum and gravity datum.
This document is applicable to geodetic surveying activities in the territory of the People’s Republic of China and other sea areas under its jurisdiction.
定价: 456元 / 折扣价: 388 元 加购物车