下述哪一个SQL语句用于实现数据存取的安全机制 A．COMMIT B．ROLLBAC 发布时间：2017-06-30 19:40 │ 来源：www.tikuol.com 题型：单项选择题 问题： 下述哪一个SQL语句用于实现数据存取的安全机制A．COMMITB．ROLLBACKC．GRANTD．CREATE TABLE
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题型：单项选择题 根据国家标准，化学试剂硫酸锰的含量测定可以用EDTA配位滴定法，测定中应先加入抗坏血酸还原试样中少量的Mn3+，因为Mn3+（）。A.可以氧化Mn2+B.可以氧化指示剂铬黑TC.可以氧化滴定剂D.是杂质，必须除去 查看答案