Overhead AC transmission lines share one characteristic; they carry 3-phase current. The voltages vary according to the particular grid system they belong to. Transmission voltages vary from 69 kv up to 765 kv. The following are examples of different overhead transmission line structures in use today. The DC voltage transmission tower has lines in pairs rather than in threes (for 3-phase current) as in AC voltage lines.
The list of signs and symptoms mentioned in various sources for Muscular Dystrophy includes the 10 symptoms listed below: 1  Gait problems. 2  Waddling gait. 3  Falls. 4  Difficulty standing up. 5  Difficulting climbing stairs. 6  Difficulty descending stairs. 7  Lordosis. 8  Firm-looking muscles. 9  Enlarged muscles. 10  Enlarged calf muscles. 11  more information...Â».
Symptoms may vary depending on the type of muscular dystrophy. There are various types of muscular dystrophy, but most children with the condition have either Duchenne or Becker muscular dystrophy. Both of these conditions cause a gradual weakening of muscles and lack of coordination, progressively disabling the child.