To counter the characteristic of suppress jamming and center of mass jamming, this paper establishes the models of noise jamming, signal power attenuation and center of mass jamming.
针对压制干扰和质心干扰的特点，分别建立了噪声干扰模型、信号功率衰减模型和质心干扰模型。
Theoretical analysis shows that the progressive failure of the surrounding rock of opening is mainly caused by strength attenuation and creep mass.
理论分析说明，巷道围岩的渐进破坏主要是岩体强度衰减和蠕变性质影响的结果。
Results:The tumors showed as a thickness or bulky mass of the local supraglottic structure with irregular margin, homogeneous attenuation and slight enhancement.
结果：肿瘤呈局部软组织增厚或团块状肿块，形态不规则，密度较均匀，增强后轻度强化；
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