下列对磁的说法中,错误的说法是()。
A、铁磁材料的磁性与温度有很大关系
B、当温度升高时,铁磁材料磁导率上升
C、铁磁材料的磁导率高
D、表示物质磁化程度称为磁场强度
参考答案:B
食管中段鳞癌,长6cm,病人有刺激性干咳,纤维支气管镜检查发现气管隆突部黏膜失去正常光泽且咳嗽时固定不动,最合理的治疗方案是()
A.食管癌切除,弓上或颈部吻合
B.食管癌切除,隆突切除成形
C.根治性放疗
D.先化疗再手术
E.先放疗再手术
— Do you know _____?
— For two days. [ ]
A. how long was Nancy back
B. how long Nancy was back
C. how long has Nancy been back
D. how long Nancy has been back