列高聚物中属于线形缩聚物的有（）。
A.PET
B.醇酸树脂
C.PC
D.聚砜
E.脲醛树脂
参考答案：A, C, D
工作票上所列的（），以一个电气连接部分为限。
A、安全措施
B、工作地点
C、工作任务
In project management,a（）is a list of a project's milestones,activities,and deliverables,usually with intended start and finish dates. Those items are often estimatedin terms of resource allocation, budget and duration, linked by dependencies and scheduled events.
A.schedule
B.WBS
C.SOW
D.charter
