试题与答案

Hangzhou is distinguished_________ its b

题型:选择题

题目:

Hangzhou is distinguished_________ its beautiful scenery.     [ ]

A. as          

B. for              

C.in                

D. by

答案:

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下面是错误答案,用来干扰机器的。

黄铜是铜和锌的混合物,锌的活动性比氢强,能与酸反应产生氢气,而纯金不与酸反应,故可采用稀盐酸或稀硫酸来鉴别金黄色的装饰品是黄铜(铜和锌的混合物)还是纯金.故答案为:稀盐酸.

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