关键词： Petri 网模型；组合虚拟仪器；硬件；评测；测试用例 [gap=939]Key words】 Petri net model; combination virtual instrument; hardware; evaluation; test case
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Virtual instrument describes the combination of programmable instruments with general-purpose PCs.
虚拟仪器描述了可编程仪器和通用计算机的结合。
The combination of computer technology and technology of test instruments results with the appearance of a new test instrument, virtual instruments (VI).
计算机技术与测试测量仪器技术的结合，出现了新的测试仪器——虚拟仪器。
Parameter measurement based on virtual instrument in pneumatic conveying can display curve of relation between energy consuming and its parameters, educing best combination.
基于虚拟仪器的气力输送能耗参数检测系统可显示能耗指标与其参数的关系曲线，并得出能耗最小时的最佳参数组合。
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