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I was doing my homework while my parents were ________ (cook)dinner.
10个月前
0.3molH2SO4中含有________molH+,________molSO42-.
1年前
按要求写词语。 1.仿写:爱憎(含反义词) ________
1年前
Many people believe that 3G mobile phones will be used in almost all everyday activities.
1年前
化学兴趣小组的同学做了以下测试:点燃酒精灯,用一张滤纸平放在火焰上,约2S后取出,纸上留下一个黑色圆环.请分析回答:
1年前