The standard for the kilogram is a platinum-iridium cylinder kept at the International Bureau of Weights and Standards in Sevres, France.
The standard for the kilogram is a platinum-iridium cylinder kept at the International Bureau of Weights and Standards in Sevres, France.
千克的标准是指置于法国塞夫勒的国际度量及标准局的白金铱圆柱为准。