在恒温恒容的密闭容器中发生反应：Fe3O4(s)＋4H2(g)
3Fe(s)＋4H2O(g)。
下列说法正确的是
| A．该反应的平衡常数表达式K＝c(H2O)/c(H2) |
| B．若容器内气体的密度或压强保持不变，均说明该反应已达到平衡状态 |
| C．若Fe3O4足量，改变起始充入H2的浓度，达平衡时H2的转化率不变 |
| D．若初始时投入4.64g Fe3O4与一定量H2，反应达平衡时容器内固体共有4g， |
则Fe3O4
的转化率为50%
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