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【单选题】
硫酸亚铁铵的制备实验中,对混合溶液调节酸性的目的是什么?A.
除到溶液中的碱
B.
防止亚铁离子（ Fe 2+ ）被氧化成铁离子（ Fe 3+ ）
C.
使亚铁离子（ Fe 2+ ）被氧化成铁离子（ Fe 3+ ）
D.
使铁离子（ Fe 3+ ）被还原成亚铁离子（ Fe 2+ ）
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【单选题】关于大众集团专用汽车检测与 VAS 5051描述错误的是?
A.
是一个集车辆诊断检测信息系统于一体的综合式检测仪
B.
汽车网络系统的故障诊断检测和波形分析中发挥着重要作用
C.
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具有读取故障码，清除故障码，动态数据分析和执行原件测试等功能
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