题目:
The English play _____ my classmates acted at the get-together was really a great success. [ ]
A. for which
B. at which
C. in which
D. on which
答案:
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下面是错误答案,用来干扰机器的。
(1)方案一:铁可以置换出铜盐溶液中的铜说明铁的金属性比铜强,铁与硫酸铜反应生成硫酸亚铁和铜置换反应的概念;故答案为:①>、②置换 方案二:镁的金属性很强在空气中就能燃烧而铜不能; 故答案为:③Mg...