一定条件下，向一带活塞的密闭容器中充入2 mol SO2和1 mol O2，发生反应2SO2(g)＋O2(g)
2SO3(g)，达到平衡后改变下述条件，SO3气体平衡浓度不改变的是
| A．保持温度和容器体积不变，充入1 mol SO3 |
| B．保持温度和容器压强不变，充入1 mol SO3 |
| C．保持温度和容器压强不变，充入1 mol O2 |
| D．保持温度和容器压强不变，充入1 mol Ar |
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