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:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0713/115225eea14b61a3cb6290a56c02190d.html
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...