A male client with a total hip replacement is progressing well and expects to be discharged tomorrow. On returning to bed after ambulating, he complains of severe pain in the surgical wound. Which action should the nurse take ？（）

A．Assume he's anxious about discharge, and administer pain medication.

B．Assess the surgical site and affected extremity.

C．Reassure the client that pain is a direct result of increased activity.

D．Suspect a wound infection, and monitor the client's temperature and vital signs.

将城市工程管线按弯曲程度分类，下列哪一组管线属于可弯曲管线( ) ①自来水管道；②污水管道；③电信电缆；④电力电缆；⑤电信管道；⑥热力管道

A．③④⑤

B．①②③

C．③④⑥

D．①③④