Have to learn some standard common sense, at least when you see the standard code, you will know what kind of technical documents it is.

GB 4706. 19-2008 is the code name of the national standard "Special Requirements for Safe Liquid Heaters for Household and Similar Electrical Appliances", which means that the rated boiling pressure of water boilers, milk heaters and bottle heaters such as coffee pots, woks, egg cookers and electric kettles that generate boiling water shall not exceed1kloc-0/.

Standards can be well written or poorly written, but this is no longer a topic of interest to ordinary users.