术后4天，下腹坠胀不适，便次增多，里急后重，排尿困难，应考虑A．急性胃肠炎B．泌尿系

A．Because more and more people move into big new houses.

B．Because many old people sell their house after their children leave.

C．Because people want to sell the old house to get money and build their own house.

D．Because children often ask their parents to sell the old house.

下述几组症状中哪项符合风湿性关节炎的表现（）

A.小关节肿痛，下腰痛，Sehober试验阳性

B.多个关节肿痛，面有皮疹，ANA（+）

C.多关节肿痛，有腹泻（或 * * 炎）史，有虹膜踺状体炎

D.关节肿痛，有链球菌感染史，心电图示一度房室传导阻滞

E.四肢大小关节肿痛，肘关节已不能伸直，晨僵明显

关于我国人口的问题的国策是（　　）

A．控制人口数量

B．实行计划生育

C．提高人口素质

D．晚婚、晚生、优育

区域经济增长的机制有哪些？

蛋白质分子对下列哪种波长有最大吸收峰

A．260nm

B．280nm

C．215nm

D．340nm

E．570nm