前上纵隔肿瘤,最常见的是() ["胸骨后甲状腺肿","皮样囊肿","淋巴类肿瘤","畸胎瘤","心包囊肿"]
男性,20岁,乏力、发热、全身痛、皮肤瘀斑半月余,查:贫血貌,体温38℃,心肺(-),胸骨有压痛,肝肋下1.5cm,脾肋下1cm,血红蛋白60g/L,白细胞总数2×109/L,血小板20×109/L,最可能的诊断是() ["再生障碍性贫血","溶血性贫血","巨幼红细胞性贫血","血小板减少性紫癜","急性白血病"]
瘤体内含有骨骼及毛发的肿瘤是() ["心包囊肿","畸胎瘤","胸腺瘤","神经源性肿瘤","淋巴源性肿瘤"]
男性,18岁。入学查体胸透发现左侧胸腔第6胸椎旁有直径6cm圆形肿大影。最可能的诊断是() ["胸腺瘤","畸胎瘤","中央型肺癌","神经源性肿瘤","淋巴源性肿瘤"]
女性,23岁,乏力和皮下瘀斑,白细胞计数110×109/L,单核细胞0.95,以下何项发现有助于鉴别此病人为急性髓系白血病而非急性淋巴细胞性白血病() ["严重贫血和血小板减少","形态学上无Auer小体","未成熟细胞过氧化物酶和苏丹黑染色为阳性","非特异性酯酶阴性","无淋巴结肿大"]
当没有国家计量校准规范时,可依据什么实施校准?