男性，40岁，跑步后出现右腰疼痛1天，尿呈淡洗肉水样，首先应行下列哪项检查( )

A．血常规和肾功能检查

B．肝功能和肾功能检查

C．CT和磁共振检查

D．尿常规检查和泌尿系X线平片

E．24小时尿钙分析

One tool that is useful during both analysis and design is the ______，which is a pictorial representation of the items of infonnation(entities)within the system and the relationships between these pieces of information．

A．data dictionary

B．dataflow diagram

C．use case diagram

D．entity-relationship diagram