21. "It's a closed loop ,'` a source inside the Maricopa County Stadium District said. 22. They fish in a closed loop that doesn't connect to other state waterways. 23. This is because the magnetic field lines are in the form of closed loops . 24. The steps are linked by a continuous metal chain that forms a closed loop . 25. The fluid from the open or closed loop is circulated through a heat pump. 26. That, being closed loops , imply the presence of diverging integrals having no mathematical meaning. 27. A basic closed loop control System, using unity negative feedback. 28. The force is contained in a close loop and the machine is extremely stiff. 29. The theoretical basis of closed loop automation is control theory. 30. This solvent turns in a closed loop process in which the solvent is recycled.
