单项选择题
When a ship is fully loaded, it needs to prevent the main engine to be（）.While a ship is fully empty, it needs to prevent the main engine to be（）.
A.overspeed；overload B.overload；overspeed C.over mechanical load；over thermal load D.over torque；overspeed
单项选择题 When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）
单项选择题 The fire of burning plastics is classified as （） fire.
单项选择题 The pistons are cooled by （） oil from the forced lubrication.
