Final answer:
A project where Exxon is contracted to handle all aspects of construction and training personnel for a refinery in Saudi Arabia is referred to as a turnkey project, especially common in the international oil industry.
Step-by-step explanation:
When Exxon, a US company, is contracted by a Saudi Arabian company to build an oil refinery in Saudi Arabia and is responsible for every aspect of the construction, including the training of operating personnel, this type of project is typically referred to as a turnkey project. Such projects are common in international business, especially within the oil industry, where companies like Exxon have been deeply involved since the discovery of oil deposits in eastern Arabia back in the 1930s. Saudi Arabia, known for its substantial oil reserves, often enters into such agreements with foreign companies to develop its infrastructure and expertise in the oil sector.