Pergunta de entrevista da empresa WDS

"Why are man-hole covers round?"

Respostas da entrevista

Sigiloso

29 de dez. de 2012

The answer and I kid you not, I had to look it up on Google, so people don't mess with them.

Sigiloso

13 de jan. de 2013

The man-hole covers are round because the cover will not easily fall into the pit which ever angle they place in but if its in any other shape there is chance for the cover to fall into the pit. That will dangerous if any one is cleaning or working in the pit if the cover closes. So the man-hole covers are round in shape.