Methods the sound level and frequency were measured according to the corresponding health criterion and measuring method at big production equipment, crush room, control room and workshop.
方法是根据有关卫生标准及检测方法对生产设备、休息室、控制室等作业场所进行声强和频谱的测量。
A classification scheme of critical points corresponding to some transitions or bifurcation is made according to the stability criterion.
根据临界点的稳定性准则，对临界点进行分类，并用以考察作为非平衡系统的多稳系统中多种临界现象。
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