发生相间短路故障对电气设备有何危害?
参考答案:
短路对设备的危害,概括起来一是电流的热效应使设备烧坏,损坏绝缘;二是由于电流大产生的电动力使设备变形毁坏。
The teacher ________ my mobile phone because I used it in class. [ ]
A. took out
B. took away
C. took off
D. took place
下列区域物体表面消毒不合格的是( )。
A.普通手术室,细菌总数≤5cfu/cm2,未检出致病菌B.急诊抢救室,细菌总数≤10cfu/cm2,未检出致病菌C.肝炎病房,细菌总数≤15cfu/cm2,未检出致病菌D.注射室,细菌总数≤15cfu/cm2,未检出致病菌E.新生儿室的工作人员,细菌总数≤5cfu/cm2,未检出致病菌