说明并定义了用户感兴趣的电热板的主要性能特性，并描述了测量这些特性的标准方法。包含加热表面的客观尺寸，用于测量有关加热时间、加热表面温度、保温能力和支撑表面温度的方法。

States and defines the principal performance characteristics of electric warming plates which are of interest to the user, and describes the standard methods for measuring these characteristics. Contains objective dimensions of the warming surface for the measuring methods concerning heating-up time, temperature of the warming surface, ability to keep warm, and temperature of the supporting surface.