China Harbor, a new Chinese restaurant, opened Tuesday at 547 Main St. in Bangor, site of a former Burger King restaurant. Heng Luu owns the restaurant with a brother and sister. She came to the United States from Vietnam in 1981 and from 1988 to 2003 operated a restaurant, also called China Harbor, in Rockland. The new restaurant, which has undergone extensive renovations since its Burger King days, seats 130. Its luncheon specials and daily specials are available all day.