HARTFORD, Conn. — An "explosive" argument on a beach in Maine in 2006 was the focus Monday during the contentious divorce trial of the chairman of United Technologies Corp. George David said his estranged wife, Marie Douglas-David, was "angry, demanding and imperious," while pressing David to give her one of the couple's multimillion-dollar homes in New York City, the Hamptons and Sweden. "It was a miserable weekend," said David, who was until last year the chief executive of UTC, the manufacturing giant ranked No.