单项选择题
Generally speaking，the fuel injected into a marine diesel engine combustion chamber is ignited by（）.
A.spark plugs B.glow plugs C.heat of compression D.a magneto
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（）.
单项选择题 Diesel engines are considered safer than gasoline engines because（）.
