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【单选题】
工业上合成尿素是用CO 2 和NH 3 在一定条件下合成，其反应方程式为2NH 3 +CO 2 一定条件 CO（NH 2 ） 2 +H 2 O，当氨碳比 n(N H 3 ) n(C O 2 ) =4 ，CO 2 的转化率随时间的变化关系如图所示，下列说法错误的是（ ）A.
该反应在60min时达到平衡状态
B.
NH 3 的平衡转化率为30%
C.
增加氨碳比可进一步提高CO 2 的平衡转化率
D.
A点的逆反应速率υ 逆 （CO 2 ）大于B点的正反应速率υ 正 （CO 2 ）
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