计算机开机后，键盘指示灯不亮，则可能是（）。
A、外壳老化
B、弹簧变形
C、接口松脱
D、电极积垢
参考答案：C
外钳工对于值班房检查的内容有哪些？
·Look at the ten statements for this part. ·You will hear a passage about "Who First Started to Smoke" ; you will listen to it twice, ·Decide if you think each statement is right(R), wrong(W) or not mentioned(NM).
Who First Started to Smoke
When a man had a bad pain in his body, Nicot would give the person some tobacco leaves to eat, and then the pain would be gone.
A．Right
B．Wrong
C．Not Mentioned
