单项选择题
Which statement is TRUE concerning fuel vapors on a vessel（）.
A.Fuel vapors gather in the lowest portions of the vessel B.Fuel vapors can only be ignited by an open flame C.Vent outlets should be located above the level of the carburetor air intake D.None of the above
单项选择题 Which is a part of a vessel’s standing rigging（）.
单项选择题 What term describes a three-strand rope laid up right- or left-handed（）.
单项选择题 What is NOT a function of the steam drum of a marine water-tube boiler（）.
