维修计算机时，在打开主机箱接触配件之前，应该（）。
A.关闭电源
B.防止振动
C.对主机箱除尘
D.释放人体上的静电
参考答案：D
Programs such as Chinese Idol, and The voice of China, which are from US and UK Shows, have been making the headlines these months.
A．adopted
B．adapted
C．transformed
D．translated
试述编制工作说明书的一般准则。
