State system for ensuring the uniformity of measurements. Ultrasonic power in liquids. General requirements to measuring methods in the frequency range 0,5 to 25 MHz
Uniform provisions concerning the approval of compression ignition (C.1.) and natural gas (N.G.) engines as well as positive-ignition (P.1.) engines fuelled with liquefied petroleum gas (LPG) and vehicles equipped with C.1 and N.G. engines and P.1. engines fuels with LPG, with regard to the emissions of pollutants by the engine