患者,男性,55岁,要求拔除左上后牙残根。投照左上颌第二磨牙根尖片后,腭侧根与上颌窦底影像重叠,可根据下列哪种征象判断牙根是否位于上颌窦内
A. 上颌窦是否过大
B. 上颌窦底是否突入牙根之间
C. 垂直角度是否过大
D. 牙周膜及骨硬板是否连续
E. 根尖周是否密度减低
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The appeal to the senses known as()is especially common in poetry.
A. imaginative
B. imaginable
C. ingenious
D. imagery
肝硬化的典型病理改变是
A. 纤维组织增生B.细胞变性坏死
B. 不同程度的炎细胞浸润
C. 再生结节及假小叶形成
D. 呈小胆管样结构的新生肝细胞
下列癌症发生与亚硝胺无关的是
A. 肝癌
B. 胃癌
C. 食管癌
D. 结肠癌 E.胆囊癌
If there is the need to compete in a crowd, to battle()the edge the surest strategy is to develop the unexpected.
A. on
B. for
C. against
D. with