题干
The party was success．We sang and danced until it came to end at midnight．
A：a；a
B：a；the
C：the；a
D：／；a
答案(点此获取答案解析）
A
断开1 mol Cl-Cl键消耗的能量为Q2 kJ, 形成1 mol H-Cl键释放的能量为Q3 kJ，下列关系式正确的是