Today,our currency(货币) is a mixture of metal coins and paper money,but it wasn't always that way.Before metal coins and paper bills existed(存在),people used a lot of unusual things to buy what they needed.In one part of the world,for example,people used the sharks' teeth for money...
”可知,在许多其他地方,钞票有各种大小和颜色,这使得人们更容易判断他们的钱的价值,故答案为Because it is easier for people to tell the value of their money. (5)题详解: 通读全文,根据第二段“There are many fantastic facts about the history of money.”可知,本文主要介绍了钱的历史,故答案为The ...
Define Mixtures. Mixtures synonyms, Mixtures pronunciation, Mixtures translation, English dictionary definition of Mixtures. n. 1. a. The act or process of mixing: an alloy made from the mixture of two metals. b. The condition of being mixed: the inevita
The oldest coins are over 2,500 years old, so we know that people used coins a very long time ago. At first, people used precious metals, such as gold and silver, to make coins. They stamped the shape of a person or animal on each coin to indicate its value. In the 13th century...
in chemistry, when two or more substances mix with each other without participating in a chemical change, the resulting substance is called a mixture. the result formed due to the combination of substances does not lose its individuality nor are they combined chemically. mixtures are the one ...
mixture corrosive to metals mixture model mixtures mix混合 Miya Serizono MIYA1173跳转接口(gwtao.com) Miyabi Natsuyaki Miyada miyadaiku 将“mixture"翻译成中文 混合物, 混合, 合成是“mixture"到 中文 的最佳翻译。 译文示例:Air is a mixture of various gases. ↔ 空氣是由許多種氣體...
Several solid metals can be melted together to make a new solid. This is called an alloy. Metal alloys are unique because the combined properties of the metals in the mixture are often more desirable than any of the single elements that are in the alloy....
(s). A more technical definition of an alloy is 'a partial or complete solid solution of one or more elements in a metallic matrix'. Common examples of alloys include bronze, brass and steels. When alloys are specified, the specification often includes the ratios of the different metals in...
The suspension can take part in the transport of specific pollutants, such as petroleum substances and heavy metals (i.e., Pb, Cd, Cu, Zn). However, it must be taken into account that these are only a few of the whole range of pollutants, as it was proven that stormwater might be ...
morphological examination are best collected in a fluid called AGA, whichisamixtureof10 parts of 60% ethanol with 1 part of glycerine and 1 part of acetic acid. ippc.int ippc.int 供形态学检测的样品最好保存在一种称为 AGA 的液体中,该液体是由 60%的乙醇、甘油 和乙酸按 10:1:1 的比例配制...