[名词解释] “富”燃料

常见的占位征象有以下病变 ["A．中线结构移位","B．脑室移位","C．脑室变形","D．脑沟变化","E．以上都是"] 头颅CT上低密度病灶常见于以下病变，错误的是 ["A．组织坏死","B．脑水肿","C．急性出血","D．软化灶","E．脂肪瘤"] “贫”燃料 MRI上、短T1、短T2信号主要见于 ["A．胶质瘤 ","B．脑膜瘤 ","C．转移瘤 ","D．黑色素瘤 ","E．听神经瘤"] 空燃比 “富”燃料