该检查适用于按照相关国际标准规定的方法进行的锰矿和铬矿，无论是天然的还是加工的。包括实验样品划分的一般条件和a）划分为三个或多个阶段或b）划分为一个或两个阶段的实验方法。

The checking applies to manganese and chromium ores, whether natural or processed, being carried out in accordance with the methods specified in the relevant International Standards. Includes general conditions for division of experimental samples and experimental methods of division a) in three or more stages or b) in one or two stages.