产品验证依赖于对实物样品的测试，使产品开发周期长，成本高。
The product validation relies on the test of real sample, which has a low efficiency and a high cost.
但传统的CAD系统多以单独系统设计为主要形式，具有产品设计开发周期长、资源共享性低、管理维护困难、开放性差等固有局限性。
But most conventional CAD systems are in single form, and they have much inherent limitation such as long period of product-design, bad resource sharing, hard management and low openness.
实践证明，所考虑的方法和步骤正确，开发的软件生命周期长，所成产品在企业的管理中发挥了应有的功效。
It proved by practice that the procedure and method presented in the paper are correct, the developed software has a longer life and the developed product has a good effect in the business management.
实践证明，所考虑的方法和步骤正确，开发的软件生命周期长，所成产品在企业的管理中发挥了应有的功效。
It proved by practice that the procedure and method presented in the paper are correct, the developed software has a longer life and the developed product has a good effect in the business management.
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