不过，至少有一个设施使用一个浮动的三角洲中学没有接地导线的话。

However, at least one facility used a floating delta secondary with no grounding conductor whatsoever.

youdao

不过，至少有一个设施使用一个浮动的三角洲中学没有接地导线的话。

However, at least one facility used a floating delta secondary with no grounding conductor whatsoever.

youdao