最基本的保护层是油漆。()
A、The principal protective coating is paint.
B、The principal protective coating is cement wash.
C、The principal protective coating is bitumen.
D、The principal protective coating is varnish.
A、The principal protective coating is paint.
B、The principal protective coating is cement wash.
C、The principal protective coating is bitumen.
D、The principal protective coating is varnish.
A、护层过电压保护器的直流参考电压应符合设备基本条件要求 B、护层过电压保护器的直流参考电压应符合设备技术条件要求 C、用1000V兆欧表测量护层保护器及其引线对地的绝缘电阻大于10兆欧 D、用1000V兆欧表测量护层保护器及其引线对地的绝缘电阻大于5兆欧