黃金基礎(chǔ)的知識點

1、黃金的基礎(chǔ)知識一、黃金的定義黃金（ Gold）即金，是一種軟的，金黃色的貴金屬；化學(xué)符號AU；它來自羅馬神話中黎明女神歐若拉（Aurora）意為閃耀的黎明。二、黃金的特性物理性質(zhì)顏色金黃色莫氏硬度 2.5，與人的指甲相近密度 19.32/ 立方厘米熔點 1064.43導(dǎo)熱性好導(dǎo)電性好延展性異常的強，1 克金可拉長 3500 米，直徑為 0.0043 毫米的金絲。三、化學(xué)性質(zhì)化學(xué)元素符號 AU，化學(xué)性質(zhì)穩(wěn)定。1、不溶于強酸強堿，具有很強的抗腐蝕性，但與化學(xué)藥品長時間接觸會使黃金變暗。2、溶于硝酸和鹽酸的混合體王水3、與水銀發(fā)生反應(yīng)黃金會變白四、黃金的價值裝飾價值，貨幣價值，收藏價值五、黃金的純度

2、標(biāo)準(zhǔn)足金 990 金稱足金，俗稱兩個9，深黃色，金含量不低于99.0%，印記為足金， 990 金。硬千足金（3D 金）純度任然是千足金的純度99.9%，采用新的黃金加工工藝，提升了黃金的硬度和抗磨性，從而解決高純度黃金軟的特點。千足金 999 金又稱千足金，俗稱3 個 9，金含量不低于99.9%,印記為千足金， 999 金。18K是指用 75%的黃金和 25%的銀、銅等貴金屬配比而成的黃金，故稱 750.(字印 750 金、 G18K、AU750)銅顏色呈粉紅，玫瑰金鐵呈藍(lán)色呂呈紫色鋅呈淡紫色鎘和銀呈綠色18K 金的特點硬度高、顏色豐富、款式多、鑲嵌牢固的特點，常被用來鑲嵌鉆石黃金的保養(yǎng)及注意

3、事項1：洗潔精、漂白劑等化學(xué)物質(zhì)會改變金子的色澤，做清潔工作之前脫掉黃金飾品，更不要用這些去清潔黃金飾品2：避免直接與香水、發(fā)膠等高揮發(fā)性物質(zhì)接觸，否則容易導(dǎo)致金飾褪色3：雖然黃金與其他物質(zhì)的化學(xué)反應(yīng)并部活躍，但佩戴仍需要格外小心，例如到游泳池游泳就絕對不宜佩戴金飾。因為游泳池水經(jīng)過加氯處理，氯氣可能令金飾產(chǎn)生氧化變得暗啞。4：到發(fā)型屋打理頭發(fā)，特別是染發(fā)和燙發(fā)，謹(jǐn)記先摘下項鏈或耳環(huán)，因為染發(fā)劑與電發(fā)藥水內(nèi)含的化學(xué)成分會使金飾上的接合部位或結(jié)合扣變色，破壞金飾整體美感。5：因為黃金傳熱率高，蒸汽的熱量可能會透過金飾灼傷皮膚，因此享受蒸氣浴時謹(jǐn)記先摘下身上的金飾。6：黃金比較軟，容易變形，所以不

4、要拉扯項鏈等飾品，以免變形。長期不佩戴時候應(yīng)用絨布包好再放進首飾箱，避免與其它首飾互相摩擦損壞。贈送以下資料英語萬能作文 (模板型）Along with the advance of the society more and more problems arebrought to our attention, one of which is that.隨著社會的不斷發(fā)展，出現(xiàn)了越來越多的問題，其中之一便是_。As to whether it is a blessing or a curse, however, people take different attitudes.然而，對于此類問題，

5、人們持不同的看法。 (Hold different attitudes持不同的看 ;Come up with different attitudes 有不同的看法 )As society develops, people are attaching much importance to.隨著社會的發(fā)展，人們開始關(guān)注.People are attaching more and more importance to the interviewduring job hunting求職的過程中，人們慢慢意識到面試的重要性。As to whetherit is worthwhile., there is

6、 a long-runningcontroversial debate. It is quite natural that people from different backgrounds may have divergent attitudes towards it.關(guān)于是否值得 _的問題，一直以來爭論不休。當(dāng)然，不同的人對此可能持不同的觀點。In the process of modern urban development, we often findourselves in a dilemma.在都市的發(fā)展中，我們往往會陷入困境。Recently the phenomenon has

7、 aroused wide concern, some peopleare in alarm that.最近，這種現(xiàn)象引起了人們的廣泛關(guān)注，有人開始擔(dān)心_。The human race has entered a completely new stage in its history, with the increasingly rapid economic globalization and urbanization, more problems are brought to our attention.人類進入了一個歷史的嶄新的階段，經(jīng)濟全球化、都市化的速度不斷加快，隨之給我們帶來了很多問

8、題。. plays such an important role that it undeniably becomes thebiggest concern of the present world, there comes a question, is it a blessing or a curse?"_顯得非常重要而成為當(dāng)今世界所關(guān)注的最大的問題，這是無可厚非的。不過，問題是："我們該如何抉擇 ?"Now we are entering a new era, full of opportunities and challenges, 現(xiàn)在我們正在進入一個充滿

9、機會和挑戰(zhàn)的新時代。People from different backgrounds would put different interpretations on the same case.不同行業(yè)的人對同一種問題的解釋不盡相同。The controversial issue is often brought into public focus. People from different backgrounds hold different attitudes towards the issue.這中極具爭議性的話題往往很受社會的關(guān)注。不同的人對此問題的看法也不盡相同。When aske

10、d ., some people think. while some prefer.說到 _，有人認(rèn)為 _，而另一些人則認(rèn)為 _。Just as the saying goes: "so many people, so many minds". It is quiteunderstandable that views on this issue vary from person to person.俗話說， ""。不同的人對此有不同的看法是可以理解的。To this issue, different people come up with various

11、 attitudes.對于這個問題，不同的人持不同的觀點。There is a good side and a bad side to everything, it goes withoutsaying that.萬事萬物都有其兩面性，所以，勿庸置疑，_。When it comes to ., most people believe that ., but other peopleregard .as .提到 _問題，很多人認(rèn)為 _，不過，一些人則認(rèn)為_是_.When faced with., quite a few people claim that ., but otherpeople t

12、hink as.提到 _問題，僅少數(shù)人認(rèn)為 _，但另一些人則認(rèn)為_。There is a public controversy nowadays over the issue of . Therewho criticize .argue that ., they believe that .,but people who favor .,on the other hand, argue that.目前，_問題爭議較大。批判 _的人認(rèn)為 _，他們認(rèn)為_，不過，另一方面，贊同_的人則認(rèn)為 _。Some people are of the opinion that.有些人認(rèn)為 _。Many peop

13、le claim that.很多人認(rèn)為 _。A majority of 絕大多數(shù)A large number of 很多人Some people contend that . has proved to bring many advantages(disadvantages)有些人認(rèn)為 _有很多有利之處 (不利之處 )。Those who argue for . say that .economic development of thecities.覺得 _的人認(rèn)為， _ 城市的經(jīng)濟發(fā)展。Some people advocate that .有些人在堅持認(rèn)為 _。They hold that

14、. 他們認(rèn)為 _。People, who advocate that ., have their sound reasons (grounds)堅持認(rèn)為 _的人也有其說法 (依據(jù) )。Those who have already benefited from practicing it sing high praiseof it.那些從中受益的人對此大家褒獎。Those who strongly approve of . have cogent reasons for it.強烈認(rèn)同 _的人有很多原因 。Many people would claim that.有人會認(rèn)為 _。People w

15、ho support . give some or all of the following reasons.那些支持 _觀點的人列出了如下原因：_。But others hold the view that .但是，另外一些人則認(rèn)為 _。觀點的用詞： Attitude, opinion,與其搭配的動詞以及詞組：Take,have, come up with，set forth, put forward 等。But on the other hand, there are also quite a few people who strongly advocate that.,.不過，另一方面，

16、也有少部分人堅持認(rèn)為_。But people who are ., on the other hand , maintain that.不過，另一方面， _的人認(rèn)為 _。However, there are a large number of people who hold a different view concerning this case.然而，很多人對此有不同的看法。問題用詞： Issue, phenomenon，后接介詞 , on, over 等。However, some others argue that. 然而，另一些人則認(rèn)為 _。However, there are al

17、so some others who contend that.然而，也有人認(rèn)為 _。But other people set forth completely totally different argument concerning this case.不過，對于此，另一些人則持完全不同的觀點。Some people examine this issue from another angle.有的人用另一角度來看這一問題。On the other hand, there are also many opponents who strongly .另一方面，也有很多反對的人，他們認(rèn)為_。Ac

18、cording to my personality and fondness, I would prefer . ratherthan.根據(jù)我的個性以及興趣， 我選擇 _而不會選擇 _。Personally, I side with the latter (former) opinion.就我個人而言，我支持后者(前者 )_。Personally, I am in favor of the former point of view.就我個人而言，我較同意前一種看法。To my point of view 我認(rèn)為Tomymind,theadvantagesfaroverweighthedrawb

19、acks(disadvantages, shortcomings)我認(rèn)為，優(yōu)點勝過缺點。For my part, I stand on side of the latter opinion that.就我而言，我較贊同后一種觀點_。As far as I am concerned, I am inclined to be on the side of the latterview.在我看來，我較同意后一種觀點。After a thorough consideration, for my part, I am in favor of thelatter view that.經(jīng)過深思熟慮，我較支持

20、后一種看法，亦即_。If asked to make a decision, I would prefer.如果真的需要作出選擇，我寧愿_。展現(xiàn)問題篇問題的常用詞： question, problem, issueRecently, the issue of . has been brought into public focus.近來， _的問題引起了社會的廣泛關(guān)注。Now we are entering a brand new era full of opportunities and innovations, and great changes have taken place in p

21、eople attitudes towards some traditional practice.現(xiàn)在我們進入了一個充滿機遇和創(chuàng)新的嶄新時代，很多人對某些傳統(tǒng)的看法也發(fā)生了很大改變。Recently the issue of whether or not . has been in the limelightand has aroused wide concern in the public.近來，是否 _的問題已經(jīng)非常明確而且引起了社會的廣泛關(guān)注。The issue whether it is good or not to . has aroused a heateddiscussion

22、all over the country._的利與弊已在全國范圍內(nèi)引起熱烈的討論。At present, some people think .while others claim .Both sideshave their merits.目前，一些人認(rèn)為 _而另一些人則認(rèn)為 _。其實，兩種觀點都其可取之處。People rarely reach an absolute consensus on such a controversial issue.對于這種極具爭議的話題，我們很難作出絕對的回答。People from different backgrounds would put different interpretationson the same case.不同行業(yè)的人對同一種問題的解釋不盡相同。The controversial issue is often brought into public focus. Peoplefrom