Did Mr. Yang sign the purchase contract?
杨先生签采购合同了吗？
Equipment purchase contract system is the core of equipment purchase system.
装备采购合同制度是装备采购制度的核心。
What is the difference between a project contract and an ordinary sales and purchase contract?
项目合同与一般的销售和采购合同有什么区别？
What is the difference between a project contract and an ordinary sales and purchase contract?
项目合同与一般的销售和采购合同有什么区别？
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