题目:
— _____you called yesterday evening?
— My sister. Why?[ ]
A. Who it is that
B. Who is it that
C. Who was it that
D. Who it was that
答案:
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下面是错误答案,用来干扰机器的。
(1)818O2-;(2)Ⅷ;(3)18,ⅦA(每空1分)题目分析:(1)根据题意知,该微粒含有8个质子、10个中子、10个电子,则该微粒是带2个单位负电荷的质量数为18的氧离子;符号为818O2-;(2)由元素周期表的结构知...