GOST 31751-2012

Printed circuit boards. Classification of defects

Services of housing maintenance, public utilities and administration of apartment buildings. Services of in-house cold water supply systems maintenance of apartment buildings. General requirements

Optics and photonics. Lenses for optical electronic systems. Methods for measuring flange focal length and back focal distance

Testing of chemicals of environmental hazard. Determination of the dissociation constants in water. (Titration method-Spectrophotometric method-Conductometric method)

Two lay steel rope type TK construction 6x19 (1+6+12)+1x19 (1+6+12). Dimensions

Occupational safety standards system. Machines and equipment for oil transportation. Safety requirements