Traditional Culture Encyclopedia - Hotel franchise - What is the third grade of quality unit?

What is the third grade of quality unit?

Mass units are metric, kilogram, gram (gram), milligram, microgram (? G) There are metric tons, public burdens, public scales, kilograms, public coins, public grams, Youke, yottagram, Yg 102 1 all grams, zettagram) ZG10/Kloc-0+08, Exegram. Petagram PG 10 12, Megagram, Kurt Tg 109, Ji Keg106, metric ton, Megagram Mg 103, kg, g10. G 10-9, nanong10-12, piquepg10-15, Fick fg 10- 18, Akag/.