推翻 发表于 2025-3-21 16:29:27
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https://doi.org/10.1007/978-4-431-56508-6The purpose of procurement is to acquire such goods, services, and/or civil engineering work that the procuring entity does not produce, provide or perform himself. The procured items are eithercorn732 发表于 2025-3-22 18:26:52
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