near the end of the prototyping stage, after engineers create actual working samples of the product they plan to produce, engineering verification testing ( evt ) uses prototypes to verify that the design meets pre-determined specifications and design goals 在原型阶段结束时,工程师创建他们计划完成的真实工作产品实例之后,工程验证测试(evt)使用原型来验证实际是否与之前决定的规范和设计目标一致。