After a hard ---fought campaign, Barack Obama won the US presidential election, and became

President of the United States---the first African –American in           

country’s history to do so.

A．the; the

B．/; /

C．/; the

D．the; /

根据《电业安全工作规程》的规定，厂内专用机动车辆遇到路面狭窄、不平和重车时，车速每小时不准超过5km，空车时不准超过（）km。

A、8

B、10

C、15