The war was over about three months ago, _____ the American soldiers in Iraq are still having a lot of trouble

to deal with. [ ]

A. or

B. and

C. but

D. so

正常的开机顺序是（）。

A、先开外设，再开主机

B、先打开主机，再开外设

C、没有顺序要求

D、先开显示器，大约几十秒后再开电源