Hebei Hankai hydraulic motor seals



The question of why manhole covers are typically round (in some countries) was made famous by Microsoft when they began asking it as a job-interview question.[8] Originally meant as a psychological assessment of how one approaches a question with more than one correct answer, the problem has produced a number of alternative explanations, from the tautological (Manhole covers are round because manholes are round)[8] to the philosophical.
Manhole covers serve multiple essential functions in urban environments. Primarily, they provide safe access points for maintenance crews who need to service the underground utilities. Regular inspections and repairs are vital to preventing larger infrastructure failures that could disrupt services or pose dangers to the public.
manhole cover 750 x 600
