嗜铬细胞瘤的CT特点是() ["A.单侧,小于2cm,低密度网格状,CT值-33~28HU
","B.单侧,大于2cm,低密度均匀肿块,CT值30~50HU
","C.单侧多见,直径2~20cm,中央坏死,少数伴有钙化,强化显著
","D.单侧,体积大,密度不均有钙化,邻近结构侵犯
E.单侧,无症状,体积大,以脂肪成分为主,CT值-80~120HU"]
简述旅游空间结构六要素。
血浆转铁蛋白增加() ["多发性骨髓瘤","肾小管功能损伤","肾小球滤膜通透性增加","弥漫性血管内凝血","缺铁性贫血"]
肿块内含有多种成分应考虑为() ["子宫肌瘤","子宫颈癌","卵巢畸胎瘤","卵巢囊肿","盆腔脓肿"]
哪项属于生产环境的有害因素() ["矽尘、煤尘、有机粉尘","X射线、γ射线","过度心理紧张","附于皮毛上的炭疽杆菌","有毒工段与无毒工段设在同一车间"]
在下列钢号中,哪些是普通碳素结构钢?哪些是优质碳素结构钢?哪些是低合金高强度结构钢?Q195,45号钢,Q345,CCS,20R