一定温度下，某一恒容密闭容器内有可逆反应：A(g)＋3B(g)
2C(g)，该反应进行到一定限度后达到化学平衡的标志是
A．单位时间内生成a mol物质A，同时生成3a mol物质B
B．物质C的生成速率和分解速率相等
C．容器内气体的密度不再随时间而改变
D．物质A、B、C的分子数之比为1∶3∶2
相关试题
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
粤公网安备 44130202000953号