A Chinese-born engineer convicted of conspiracy to export U.S. defense technology to China was sentenced Monday to 24 1/2 years in federal prison by a judge who said the defendant betrayed his adopted country. Chi Mak, 67, who worked on naval propulsion systems, was also convicted of acting as an unregistered foreign agent, attempting to violate export control laws and making false statements to the FBI. Federal prosecutors asked for 30 years, while Mak's defense team proposed 10 years. There is no parole in the federal prison system. Mak asked U.S. District Judge Cormac J. Carney for leniency before sentencing....