向1 L仅含Fe2+、I-、Br-的溶液中通入适量氯气,溶液中这三种离子的物质的量的变化如图所示,下列说法中正确的是
| A．线段Ⅲ表示Fe2+的变化情况 | B．线段Ⅰ表示Br-的变化情况 |
| C．原溶液中c(FeBr2)="4" mol·L-1 | D．a数值等于6 |
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