在一定温度下,某容积固定的密闭容器中,建立下列化学平衡:C(s)+H2O(g) CO(g) +H2(g)。下列叙述中不能说明上述可逆反应已达到化学平衡状态的是( ) A.体系的压强不再发生变化 B.v正(CO)=v逆(H2O) C.生成n mol CO的同时生成n mol H2 D.1 mol H—H键断裂的同时断裂2 mol H—O键 答案:C in the queen for an hour, he suddenly realized he had left the cheque at home. A.Waiting B.To wait C.Having waited D.To have waited