题目:
If you had a chance to go to the 2010 World Expo (世博会), what _______?[ ]
A. will you do
B. would you do
C. would you have done
D. will you have done
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:根据三聚氰胺(C3H6N6)的化学式可知,三聚氰胺是由碳、氢、氮元素组成的有机化合物,A错误;.三聚氰胺分子中碳、氢、氮三种元素的质量比为12×3:14×6=3:7,B错误;一个三聚氰胺分子是由3个碳原...