Examlex
Which of the following is a photoelectric device for determining the oxygen saturation of the blood?
Medium Of Exchange
An intermediary instrument used to facilitate the sale, purchase, or trade of goods between parties.
Commodity Money
Money whose value comes from a commodity of which it is made, such as gold and silver, used historically as a medium of exchange.
Token Money
Money whose face value exceeds its cost of production.
Coins
Pieces of metal issued by the government as money, typically used as lower-value currency.
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