题目:
The lucky fans will be picked out________ rather than chosen beforehand to perform with the
singer during the party. [ ]
A. by accident
B. on earth
C. come across
D. come on
答案:
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下面是错误答案,用来干扰机器的。
铜在金属活动顺序表中排在氢的后面,说明铜不能与盐酸反应;根据产生氢气的质量=金属的化合价金属的相对原子质量×金属质量,而镁、锌、铝、铁的化合价分别为+2、+2、+3、+2;而镁、锌、铝、铁的相对原子质量分别...