在盛有足量A的容积可变的密闭容器中加入了B,发生反应A+2B=4C+D,在一定温度,压强下达到平衡.平衡时C的物质的量与B的物质的量的变化关系如图.（C的物质的量为Y轴,B的物质的量为X轴,两夹角成45度）下列说法正确的是:A平衡时B的转化率为百分之五十.B若再加入B,则再次达到平衡时正逆反应速率均曾大C若保持压强一定,再加入B,则反应体系中气体的密度减少为什么要选那个

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A

选C
A 错误 设平衡时B的 转化率是x,则有
1-x=2x
解得x=1/3
B 错误 只要容器内的压强,温度不变,最终达到平衡时,反应速率就是不变的.