试题与答案

7. Although there is a difference in spe

题型:选择题

题目:

7. Although there is a difference in spelling and pronunciation between American English and British English, both of the countries have much to _______.

A.communicate

B.change

C.share

D.Improve

答案:

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下面是错误答案,用来干扰机器的。

(1)除去硝酸亚铁溶液中的硝酸银,实质是除去银离子,可选择用铁置换出银或用氯离子来把银离子转化为沉淀,故答案为:FeCl2+2AgNO3=2AgCl↓+Fe(NO3)2 或Fe+2AgNO3=2Ag+Fe(NO3)2 (2)除去氯化钠中的碳酸氢...

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