题目

.某正三价金属元素A,它的氧化物中含氧元素的质量分数是30%,则A的相对原子质量是 (    ) A.56        B.27           C.32          D.16 答案:A—Jerry, How did Tom ____the news? —He said nothing. A. replay to      B. contact to      C. answer to      D. respond to
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