不属于硫喷妥钠的临床应用是： A.
兴奋食欲 B.
诱导麻醉 C.
抗惊厥 D.
安乐术

In ancient times wealth was measured and exchanged in t...

单项选择题In ancient times wealth was measured and exchanged in things that could be touched：food, tools, and precious metals and stones. Then the barter system was replaced by coins, which still had real value since they were pieces of rare metal. Coins were followed by fiat money, paper notes that have value only because everyone agrees to accept them.
Today electronic monetary systems are gradually being introduced that will transform money into even less tangible forms, reducing it to a series of “bits and bytes”, or units of computerized information, going between machines at the speed of light. Already, electronic fund transfer allows money to be instantly sent and received by different banks, companies, and countries through computers and telecommunications devices.
The author mentions food, tools and precious metals and stones together because they are all ____.（　　）

某项目建设临时占用10亩湖滨芦苇滩地，项目建成后该临时占地应恢复为（　　）。A.林地B.草地C.园地D.湿地

单项选择题某项目建设临时占用10亩湖滨芦苇滩地，项目建成后该临时占地应恢复为（　　）。

In ancient times wealth was measured and exchanged in t...

单项选择题In ancient times wealth was measured and exchanged in things that could be touched：food, tools, and precious metals and stones. Then the barter system was replaced by coins, which still had real value since they were pieces of rare metal. Coins were followed by fiat money, paper notes that have value only because everyone agrees to accept them.
Today electronic monetary systems are gradually being introduced that will transform money into even less tangible forms, reducing it to a series of “bits and bytes”, or units of computerized information, going between machines at the speed of light. Already, electronic fund transfer allows money to be instantly sent and received by different banks, companies, and countries through computers and telecommunications devices.
According to the passage, which of the following was the earliest kind of exchange of wealth?（　　）