题干
Our budget is extremely ________, so you'd better work out exactly how much money will go for each part of the project.
A：valid
B：specific
C：tight
D：flexible
答案(点此获取答案解析）
C
2NH3（正反应是放热反应）;达到平衡,当单独改变下列条件后,有关叙述错误的是( )
