决策系统的发展从技术层次上可划分为：专用的决策系统、决策支持系统生成器和 ______。
参考答案：决策支持系统工具
Alex: Why are you still here? It's almost eight o'clock.
Tom: Because I ______ my work. Don't worry. It's almost done. [ ]
A. wasn't finishing
B. wouldn't finish
C. haven't finished
D. won't finish
美国有关工程造价的定额、指标、费用标准等一般是由()制订。
A.政府建设主管部门
B.土木工程师学会
C.各专业协会、大型工程咨询公司
D.建筑师学会
