For the maintenance of circulation commemorative coins, these four knowledge you must know!
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There are currently two categories of commemorative coins, that is, precious metal commemorative coinmust后面加什么s andfour怎么读 circulation commemorative coins. Among them, the material of circulation commemorative coins is copper nickel alloy, copper acoinsinind steemustl core nickcirculation中文意思el. How much do you know? ? What do you know
?
Let’s learn together. 
First, moisture-proof
As a metal product, commemorative Currency must have a higher decirculation deskmand for humidity in the environment. Therknowledgeefore, when scoins是什么意思aving commemorative coins, you must pay attention to the environment stored by the commemorative coins, which can be placed in a box, or in a vacuum plastic bag, try to avoid exmaintenance什么意思中文翻译cessive comust后面加什么ntact with the air.
Second, an acid-base
The acid-base and metal are placed together, which causes high corrmustacheosion to commemorative coins. Therefore, in the long-term placement process, it must be kept away from acthesealife是什么牌子id-knowsbase substancescirculation杂志.
Third, anti-bumpmaintenance翻译er 
The bump of the currency is bound to Memorial coins cause damage, affecting beauty, andknowledge造句简单九年级 also affects collectors’ mood. Therefcirculation是什么意思ore, in the process of appreciation, wear gloves
;
Duriknowledgeableng the storage procesfours, it should also be as easy as pocommemorative speech范文ssible, and away from the hard objefour怎么读ct.
In addition, this similar ccommemorative stamp翻译ommemorative currency should be wiped after the collection of monoliths should first wipe the box before the cmaintenance动词ollection of commemorative coins. If tcoinshop交易所he storage is not properly, some copper coins will appear on the surface in the humid environment. Remove this kind of copper rust, don’t force it after dirty ! Although it seems to be verythese英语怎么读发音 beautiful,
40 [123 ] The magnifying glass below the following does not see the problem, but it wilknowledgel make the surface of the currency have tinyfour怎么读 damage, and thitheses damage will exacerbate the oxidatimaintenance什么意思on ! [ Fourtmust的一般疑问句用法及回答h, anknowledgeableti-progentcirculation杂志 In appreciation of commemoratcommemorative speech范文ive coinscirculation影响因子 or the process of playing, we should wear stthese英语怎么读发音andards. Gloves or usecirculation desk pmaintenance什么意思rofessional tools, etc.
Remember not to directly use the helper or wet hand touch flow commemorative coins, sweat and other liquids may cause corrosion to the commemoratcommemorative coinive currency form. 
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