下面哪种拍摄姿势不可取() ["A、站姿拍摄","B、抱机拍摄","C、跪蹲拍摄","D、卧姿拍摄"]
南朝的首都是:() ["A、武昌","B、建康","C、南阳","D、杭州"]
女性55岁,CT示胆总管重度扩张,形态不规则,在胰头上方中断消失,最可能的诊断是()。 ["胆总管结石","胆总管炎性狭窄","胆总管癌","胆囊癌","胰头癌"]
南朝时期,宋、齐、梁、陈四国政权延续时间最短的是:() ["A、齐","B、宋","C、梁","D、陈"]
交界性肿瘤属于()。 ["性质介于良、恶性之间的肿瘤","混合性肿瘤","癌前病变","良性瘤的局部恶变","分化好的恶性肿瘤"]
农村的水稻夜间要注水,白天要放水,为什么?