Schedule development can require the review and revision of duration estimates and resource estimates to create an approved project schedule that can serve as a baseline to ______ progress.

A．analyze

B．track

C．level

D．extend

各种施工合同示范文本一般都由（）组成。

A.协议书

B.投标书及其附件

C.专用条款

D.通用条款

E.中标通知书