Gold is a soft and stable (稳定的) metal. In ancient times, people started to make it into different things, such as coins. Today, people still make it into beautiful jewelry. No matter how much time passes, gold always looks as good as ...
Gold is the only yellow metal found on Earth.Gold has been used by humans for more than6 000 years.The first gold coins were made about2500 years ago.Gold is valuable because it is rare.Gold is valuable because it is strongand lasts a long time.Gold is valuable because it has many us...
In the 1800s, there was a metal that was even more valuable than gold. It is aluminum. Rich ladies wore jewelry made of aluminum. Kings served their guests on aluminum plates. However, aluminum is not rare. In fact, it’s the most common metal. Only it was difficult to get it. ...
Gold is a relatively rare metal with lots of versatility. It’s highly malleable, meaning it can be deformed or changed without fracturing the material. But what distinguishes it from other useful precious metals is its tot...
2.Even the play’s most minorcharacters work together with extraordinary skill, their interplay creates amoving theatrical experience. A, their interplay creates a movingtheatrical experience. B, a moving theatrical experience iscreated by their interplay ...
Explosion of rare earth metal dust in nitrogen-water vapor atmosphere. (publication: Archivum Combustionis, Vol. 17, No. 1-4, pp.145-152, 1997)Marian GierasPiotr WolanskiT HayashiH Matsui
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Its physical properties make the “yellow metal” an indispensable element in everything from space probes and electronics to medical implants and cancer treatments. 1: Gold Is Very Rare Gold is one of the rarest elements on the Earth. This rarity is responsible for much of gold's value. As...
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Although gold is used on a smaller scale in technology, China has sought gold for economic and geopolitical factors, mainly to diversify its foreign exchange reserves, which rely heavily on the U.S. dollar. Analysts estimate China has bought a record 400 tonnes of gold in recent years. China...