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[问答题,简答题] 什么是原发性脑损伤和继发性脑损伤?

上颌骨骨折中最具诊断意义的症状是() ["牙齿折断或移位","面部肿胀","上颌骨出现动度和错位","脑震荡","鼻腔出血"] 切牙舌向移动1mm需要间隙()。 ["2.5mm","3mm","2mm","1mm","1.5mm"] 在双缝干涉实验中,一钠灯发出的波长为589nm的光,在距双缝1.00m的屏上形成干涉图样。图样上相邻两明纹中心间距为0.350cm,则双缝的间距为() ["2.06×10-7m","2.06×10-4m","1.68×10-4m","1.68×10-3m"] 与继发龋发生无关的是() ["A.腐质未去净","B.洞形制备不良","C.材料调制不当","D.充填操作不当","E.未做窝洞消毒"] 茶碱的有效血药浓度范围正确的是() ["0-10μg/ml","15-30μg/ml","5-10μg/ml","10-20μg/ml","5-15μg/ml"] 什么是原发性脑损伤和继发性脑损伤?
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