Variations may be initiated by the Engineer at any time prior to issuing the Taking-Over Certificate for the Works, either by an instruction or by a request for the Contractor to submit a proposal.
在颁发工程接收证书前的任何时间，工程师可通过发布指示或以要求承包商递交建议书的方式，提出变更。
The is divided into four parts: In the first part, the article analyzed the history of the system of instruction upon request and the reason for its formation anf development ;
第一部分分析了案件请示制度的历史以及其形成的原因；
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