下述数据中，不属于时间序列的是（）。
A．公司历年的利润额
B．股票价格的日变动
C．某商品的日成交量
D．某保险公司投保人的年龄
参考答案：D
（）management includes negotiating the terms and conditions in contracts and ensuring compliance with the terms and conditions, as well as documenting and agreeing on any changes or amendments that may arise during its implementation or execution.
A.Contract
B.Document
C.Communication
D.Risk
具有（）、（）、完成有用功或实现能量转换等三个特征的构件组合体称为机器。
