A. Because they were durable and portable. B. Because they were recognizable. C. Because they were divisible. D. All of the above. 相关知识点: 试题来源: 解析 D 正确答案:D 解析:细节题。题干意为:“珍贵金属渐渐地用于制作钱币,这是为什么呢?”根据第一自然段最后一句,其原因应是portable,durab...
Legislation sets full-court press to find alternative metals.In this article the author discusses his views on the newly introduced legislation in the U.S. which requires the Treasury Department to conduct research to find alternative coinage metals used in coins.Deisher...
awhy were precious metals gradually used for making coins 为什么是为做逐渐使用的贵重金属铸造[translate]
athis looks 串珠的项链 [translate] awhat colours have you got 什么颜色有您得到 [translate] awere you at home yeste rday? 在家您是否是yeste rday ? [translate] aWhy were precious metals gradually used for making coins? 为什么贵重金属为做硬币逐渐使用了? [translate] ...
Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products.GoldGold An important metal for thousands of years - uses, prospecting, mining, production.SilverSilver - The soft, white, native, metallic element with extreme properties and diverse uses....
characteristics.So it is used in a variety of musical instruments.Presently, copper is used in building construction.As a result, copper was important to early humans.We'd better recycle this metal and save natural resources.Copper was first used in coins and decorations starting about 8,000 ...
In the past, the precious metals used by the Mint mostly came from the ground. The process always cost much and took a long time. Now the Mint plans to make use of the large amounts of e-waste that is thrown away in the UK each year. Many electrical devices use small amounts of ...
are used widely in their pure state.Other metals are usually added to them to form mixtures called alloys.(很多纯金属并不能被广泛应用,通常都加入其他金属形成合金。)Sometimes chemical elements other than metals are included in alloys.The most important is carbon.(有时合金中也含有非金属元素,最...
Salt,shells or metals are still used as money in out of- he way parts of the world today.Salt may seem rather a strange(19)___to use as money,(20)___in countries where the food of the people is mainly vegetable,it is often an(21)___necessity.Cakesb of salt,stamped to show th...
Coins of metal compounds with modulated magnetic signals consist of a nuclear layer and at least two electrodeposits, consisting of magnetic or non-magneti... Coins of metal compounds with modulated magnetic signals consist of a nuclear layer and at least two electrodeposits, consisting of magnetic ...