CT示L4椎体后缘有一局限性软组织密度影，硬膜外脂肪层消失，硬膜囊受压，变形，神经根

男性，32岁。反复腹泻、右腹痛1.5个月，低热1周入院。入院查体：T37.5～38.5℃，肝脾不大，肝区轻叩痛，右下腹轻压痛，未扪及包块，血象WBC10×10/L，N0.8；超声检查：右肝后叶上段见5.2cm×5.0cm肿块，类圆形，边界清楚，有包膜，内部回声分布不均匀呈实性团块状，后方回声增强，CDFI示其内未见血流信号。

仅从声像图上该肿块应与下列哪些病变鉴别（）

A.阿米巴肝脓肿

B.原发性肝癌

C.肝囊肿合并感染

D.转移性肝癌

E.肝血管瘤

F.肝结核

G.肝局灶性结节增生

H.肝腺瘤

文坛在经历了秦代和汉初的沉寂之后，到西汉（）时期作家群体再度生成，并且随着时间的推移生生不已，人才辈出。

试述选择性α受体阻滞剂的药理作用。

To the west and off the European Continent (欧洲大陆), there are several thousands of islands on the Continent shelf. They are generally called Great Britain. For the convenience’s sake, it is often shortened to Britain. Still to the west of Great Britain is the second largest island known as Ireland. The United Kingdom of Great Britain and Northern Ireland (UK) is made up of Great Britain, Northern Ireland, and a number of smaller islands around them. The total area of the country is some 240 000 square kilometers with a population of about 56 million.

企业形象调查的目的是（）。

A.了解企业形象现状

B.找出企业的不足

C.发展企业的核心竞争力

D.改变企业现在在人们心目中的形象