单项选择题
When ship is fouled, increasing the fuel injection for keeping the normal speed will cause the main engine （）
A.to work as overload characteristic B.overspeed C.over mechanical load only D.over thermal load only
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.
单项选择题 Engine parameters shall be corresponded to NOx Technical Files,This is required by（）
