According to the A.C. Nielsen Co., here are the top 10 shows for the week ending Dec. 3, their networks and ratings. (Each rating point equals 959,000 homes.) 1. Seinfeld, NBC, 19.4 2. Frasier, NBC, 17.8 3. Friends, NBC, 16.8 4. Home Improvement, ABC, 16.7 5. Monday Night Football, ABC, 15.7 6. Frasier, NBC, 15.4 tie NYPD Blue 8. Grace Under Fire 9. Frasier, NBC, 14.6 10. Coach, ABC, 14.4