The purchaser shall have the full power, subject to the provisions hereinafter contained, at any time during the contract to issue instructions the contractor so as to alter, amend, omit, or add to any of the project services.

• 购买方享有充分权利在合同有效期间的任何时候向承包方发出指令，以对任何工程服务项目进行修改、充、减或增加，但在行使该权利的同时，购买方必须遵守本章下述条款。