题干
Many teenagers often go to school without ____ (have) breakfast. It is not good for them.
答案(点此获取答案解析）
having
Many teenagers often go to school without ____ (have) breakfast. It is not good for them.
2NH3（g），平衡时测得N2的转化率为12%，则在相同温度和压强下，平衡时混合气体的体积是反应前的