The engineer's estimate is based on the completed plans and specifications when they are ready for the owner to solicit bids from construction contractors.
工程师估算要以明确的施工计划和施工说明为基础，并且业主也可以据此发包选择施工承包商。
Consequently, the detailed estimate is often used as the budget estimate since it is sufficient definitive to reflect the project scope and is available long before the engineer's estimate.
因而，在工程师估算完成前的相当长时间里，只能用详细估算来作为控制预算，因为详细估算也能充分明确地反映项目的范围。
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