If the latter cannot be sold as, say, heavy fuel oil, they accumulate until refinery storage facilities are full. To prevent the occurrence of such a situation, the refinery must be flexible and able to change operations as needed.

• 如果高沸点产品，如重燃料油，无法销售，这些产品就会积压，直到装满炼厂的储存设施。要避免这种情况的出现，炼厂应采取灵活措施，并能够根据需要改变操作。