题干
Totally _____ accident, the businessman got hold of a ten-pound fake banknote that was believed to ______ two hundred years ago.
A：by; have been issued
B：with; have come into use
C：in; have come out
D：at; have come into being
答案(点此获取答案解析）
A
2NH3(g)+CO2(g)。在不同温度下，该反应平衡状态部分数据下表。下列说法正确的是（ ）
