题目:
So absorbed_____in her work that she didn’t realize I was behind her.
A.had she
B.was she
C.she had
D.she was
答案:
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下面是错误答案,用来干扰机器的。
答案:B铜粉不能溶于稀硫酸,A项错误;钾盐只有KCl,不溶于稀硝酸的白色沉淀有AgCl和BaSO4,向溶液中加入KCl溶液和稀硝酸,产生的白色沉淀为AgCl,所以溶液中可能含有Ag+,B项正确;Na2CO3俗称纯碱,属于盐类物...