This paper presents a method with mixed spectra for analyzing rotational accuracy of spindles, making use of the modified periodogram test combined with dynamic data system modeling.

本文采用动态数据系统建模分析法与改进的周期图检验法相结合，对主轴回转精度进行混合谱分析。

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Finally, the random buildup of a test paper is achieved by means of automatic buildup, handmade buildup, and hand typing, thus making the Net test System more convenient.

最后，实现了自动组卷、手动组卷和手工录入试卷三种组卷方式的自由结合，更大地提高了网上作业和考试系统的便利性。

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[abstract] This paper utilize the model box system designed by soil dynamic department of tongji university, making a series of dynamic test of different moisture content of iron ore powder.

【摘要】采用同济大学土动教研室设计的模型箱设备对不同含水率下的铁矿粉进行一系列的动力试验。

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