单项选择题
Sudden unloading of a diesel engine can cause（）.
A.decreased fuel efficiency B.increased exhaust temperature C.black smoke D.overspeed trip
单项选择题 Storage batteries on T-Boats must be located（）.
单项选择题 Please supply my vessel（）120 tons of diesel oil.
单项选择题 Overspeed of the diesel engine driving an electric generator could cause（）.
