接地的定义?
参考答案:接地:是指电气设备(装置)必须接地的部分(如电气设备的金属外壳)与大地接地装置间作良好的连接,称"接地"。
The teachers are supposed to teach us about “safe sex” but most of them are too________.
A.embarrassed
B.allergic
C.funny
D.worried
EI32-JD计算机联锁系统控制台鼠标故障的现象是什么?