单项选择题
What is the harmful effect of sulfur in a fuel?（）
A.It causes excessive smoking and soot at low firing rates B.It doesn’t readily burn when combined with oxygen C.It clogs fuel oil strainers more often D.It forms a corrosive acid when mixed with water or water vapor
单项选择题 The flash point of a liquid refers to the temperature （）
单项选择题 The flash point of a petroleum product is an indication of its（）
单项选择题 The Garbage Record Book, as a part of the ship’s official logbook, shall be kept on board and preserved for a period of （）
