...escriptive research） 和因果性调研（causal research） 按调研的目的分：问题识别研究（problem identification research）和 问题对策研究 （problem solving research） 按预测的性质分：定性预测（qualitative forecast）和定量预测（quantitative..
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It is the first time to research into the identification problem of major hazard source concerning widespread mined-out area instability systematacially.
首次对大面积采空区失稳的重大危险源辨识问题进行了系统研究。
This dissertation performed the following work based on the research before: (1) We studied the modulation identification problem of analogue modulated signals.
本文在前人的研究基础上主要做了如下工作：(1)研究了模拟调制信号的识别方法。
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