∵∠COD比∠DOA大28°，∴∠COD=∠DOA+28°，∵∠AOC=90°，∴∠COD+∠DOA=90°，∴∠DOA+28°+∠DOA=90°，2∠DOA=62°，所以∠DOA=31°，∵OB是∠AOC的平分线，∴∠AOB=∠BOC=12∠AOC=45°，∴∠BOD=∠AOB-∠DOA=4...