单项选择题
How does combustion air enter the cylinder of a two-cycle diesel engine?（）
A.Cylinder head valves B.Ports C.Turbo chargers D.Bleeder valves
单项选择题 Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
单项选择题 For most ship engines，the fuel is（）.
单项选择题 Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
