Which three statements are true regarding single-row functions?()
A. They can accept only one argument.
B. They can be nested up to only two levels.
C. They can return multiple values of more than one data type.
D. They can be used in SELECT, WHERE, and ORDER BY clauses.
E. They can modify the data type of the argument that is referenced.
F. They can accept a column name, expression, variable name, or a user-supplied constant as arguments.
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大学生屡屡遭受人身伤害和财产损失的一个重要原因就是自身的安全防范意识薄弱。
A. 正确
B. 错误
发电企业每年度应根据哪些变化,对技术监督工作五个方面进行补充、完善、细化?
列尾装置故障时,车辆乘务员在列车()、停车站进站前和出站后,应按规定与司机核对列车尾部风压。