【单选题】2000年5月,保利集团在香港拍卖会上花费3000多万港币购回在火烧圆明园时流失的国宝:铜铸的牛首、猴首和虎首。普通铜器时间稍久,便容易出现铜绿,其主要成分是[Cu2(OH)2CO3]。但这三件1760年铜铸的国宝在240年后看上去仍然熠熠生辉,下列对其原因的分析,最可能的是()
B.
环境污染日趋严重,它们表面的铜绿被酸雨溶解洗去
【简答题】密度计法测定油品密度时,读数是按弯月面________读数,并准确到________g/cm3。
【单选题】—I'm interested in that chair. How much do you want for it? —$— ______ . I'll give you $—No, that's not enough.
A.
The Chair is really nice
C.
Please lower the price
D.
Nobody will have it except me
【简答题】Please tell us the time that suits you for us to set up the visit. I'll give you a call this afternoon to the time.
【单选题】听力原文:Could you give me a hand? (3)
D.
Certainly, what can I do for you?
【单选题】在火烧圆明园时流失了大量的国宝,如:铜铸的鼠首和兔首。普通铜器时间稍久容易出现铜绿,其主要成分是〔Cu 2 (OH) 2 CO 3 〕,这两件1760年铜铸的国宝在240多年后看上去仍然熠熠生辉不生锈,下列对其原因的分析最可能的是 [ ]
B.
环境污染日趋严重,它们表面的铜绿被酸雨溶解洗去
【简答题】I'll give you( )for working overtime.
【简答题】(5分)请根据常见的金属的知识回答有关问题: (1)写出地壳中含量最多的金属元素的符号 。 (2)解释不能用铁制容器配制硫酸铜溶液的原因(用化学方程式表示)_____________; (3)铬、铜及其合金在交通工具上随处可见,现将铬(Cr)插入Cu(NO 3 ) 2 的溶液中,铬上有红色物质出现。则铬和铜相比,金属活动性强的是______________; (4)目前铝在多个领域替代易生锈的钢铁...
【单选题】—I'm interested in that chair. How much do you want for it —$25.00. —_______. I'll give you $15.00. —No, that's not enough.
A.
The chair is really nice
C.
Please lower the price
D.
Nobody will have it except me