第25题:[单选题] Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge ______. A. only when fully loaded B. if one or more tanks are full C. when transferring cargo D. only when the barge is being towed 参考答案:D 【参考译文】只有被拖带时,无人油驳船的货油舱区域才须配备手提式灭火器。 【解 析】portable fire extinguisher手提式灭火器 fully loaded满载的