【单选题】
在体积为VL的密闭容器进行如下反应：<img src='http://img.shangxueba.cn/images/2010q3/ct_jggysbnjxj_jggysbnjxchoose_0231(106)1.jpg' />则t min 时，D物质增加的物质的量为( )。<br/> <img src='http://img.shangxueba.cn/images/2010q3/ct_jggysbnjxj_jggysbnjxchoose_0231(106)2.jpg' />
A、shangxueba.cn/images/2010q3/ct_jggysbnjxj_jggysbnjxchoose_0231(106)1.jpg'
B、shangxueba.cn/images/2010q3/ct_jggysbnjxj_jggysbnjxchoose_0231(106)2.jpg'
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