下述病变哪项是纤维性病变() ["炎性假瘤","韦氏肉芽肿","癌性淋巴管炎","Ⅲ期矽肺","肺水肿间隔线"]
一个高8米高很长的屏障安装在离户外空压机6米距离处,离它60米的临近地界线上,由于屏障引起的附加衰减为()。(空压机的峰值声压级为500HZ,声速为340m/s,设空压机靠近地面,地面是光滑的混凝土路) ["6.5dB","8.6dB","9.6dB","12.0dB"]
简述过敏性紫癜
骨骺或骨端钙化带凹陷而无硬化,在儿童关节病中常见于() ["佝偻病","坏血病","缺血性坏死","粘多糖病","关节结核"]
膝关节十字韧带撕裂时,错误的是() ["形态呈波浪状","韧带内可见高信号","正常韧带轮廓分裂","横轴位易于显示","检查时膝关节应摆轻度外旋位"]
简述教师职业的基本特点。