Prototyping is a more hands-on type of modeling that can involve a mock-up, test-of-principle, or actual working version of a specific area of the design.

原型是一种非常有帮助的建模类型，它可以用于模拟，原理测试，或者设计的特定方面的实际工作。

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The design and type of switching CARDS used in an IR test system depend on several factors, including the test voltage, magnitude of resistance, accuracy, com mon connection, etc.

IR测试系统中采用的开关卡的设计和类型取决于多个因素，包括测试电压、电阻数量级、准确度、共用连接，等等。

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In product design, process and material have a major change in type test should be done.

产品在设计、工艺及材料有重大变化时应做型式检验。

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