题干
He suddenly found __ watch on the ground．
A：a gold small nice
B：a nice gold small
C：a nice small gold
D：a small nice gold
答案(点此获取答案解析）
C
A：a gold small nice
B：a nice gold small
C：a nice small gold
D：a small nice gold
2NH3(g) △H <0，在673K、30MPa下n(NH3)和n(H2)随时间变化的关系如下图所示。下列叙述正确的是（ ）
