本文件规定了机械产品数字实体模型虚拟装配测试（VAT）的要求，该测试适用于指导实际生产前的虚拟装配测试。本文件的应用旨在实现有效的增值税和高效的现场组装。该测试适用于理论上精确尺寸的3D标称模型。

This document specifies the requirements for a digital mock-up virtual assembly test (VAT) for mechanical products, which is suitable for guiding virtual assembly testing before physical production. The application of this document is intended to result in an effective VAT and efficient on-site assembly. This test is applicable to 3D nominal models with theoretically exact dimensions.