单项选择题
Diesel engines are considered safer than gasoline engines because（）.
A.they are more heavily built
B.the fuel used is less volatile
C.they can be easily reversed
D.they operate at a lower speed
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相关考题
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单项选择题
Before starting any diesel or gasoline engine，which of the following must be checked? （）
A.Oil level
B.Flow of cooling water
C.Exhaust discharge
D.All of the above -
单项选择题
All marine low-speed diesels are of what design?（）
A.Four-stroke
B.Two-stroke
C.Electronic ignition
D.Forced exhaust -
单项选择题
All diesel engines are classified as（）.
A.four cycle
B.compression ignition
C.vacuum ignition
D.external combustion
