si

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sisisiAnInternationalSystemofUnitsofmeasurementinwhichthefundamentalunitsarestandardised.Examplesinc

si
si

si
An International System of Units of measurement in which the fundamental units are standardised.
Examples include:metre,kilometre,ampere,gray,joule,Sievert,Becquerel.
Origin:Fr.Le Systeme International d'Unites
即国际单位制