单项选择题
Which of the following represents the maximum percent of oxygen by volume required to be achieved by a ship’s inert gas system, prior to the commencement of crude oil tank washing?（）
A.6% B.8% C.10% D.12%
单项选择题 The fire of burning paper is classified as（）fire.
单项选择题 The fire of electrical equipment is classified as（）fire.
单项选择题 The fire of fuel oil is classified as（） fire.
