结节型肺泡细胞癌的X线表现是（） ["片状阴影","多有空洞","类似肺炎","常伴有肺叶不张","与周围型肺癌相似"]
可呈"哑铃"状生长的纵隔肿瘤是（） ["胸腺瘤","气管囊肿","心包囊肿","神经源肿瘤","淋巴瘤"]
容易合并重症肌无力的纵隔肿瘤是（） ["神经源肿瘤","纵隔淋巴肉瘤","畸胎瘤","胸腺瘤","心包囊肿"]
食管癌的典型症状是（） ["咽下梗噎感、","食管内异物感","胸骨后烧灼感","进行性咽下困难","胸痛"]
滑轮的报废标准是什么？
使用照明变压器和行灯应注意什么？
