abbr. 英国政府信件不用邮资印（On His Majesty's Service）；为女王陛下效劳（On Her Majesty's Service）
英语释义
1
n. a unit of electrical resistance equal to the resistance between two points on a conductor when a potential difference of one volt between them produces a current of one ampere
2
n. German physicist who formulated Ohm's law (1787-1854)