Roofing and hydraulic-insulating flexible bitumen-based and polymeric (thermoplastic or elastomer) materials. Method for determination of resistance to root penetration
State system for ensuring the uniformity of measurements. National standard. Standard reference data. Pyezokeramik on the LiaKbNacNbdTamSbnO3+z[Bi2O3–Fe2O3]. Dielectric and piezoelectric properties at a temperature of 25 °C
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