单项选择题
The main purpose of changing main engine to electronic controlled is not to（）
A.control fuel injection time more precisely
B.control fuel injection rate more precisely
C.meet the environmental requirements
D.meet high engine speed requirements
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相关考题
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单项选择题
To meet the market requirements, a marine diesel engine should not be of（）
A.big size
B.fuel economy
C.low speed
D.high power -
单项选择题
The common rail engines show great advantages in combustion especially（）.
A.at high speed and full load
B.at low speed and part load
C.when heavy fuel oil is used at sea
D.when the ships run long distance -
单项选择题
A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.
A.can’t be controlled very precisely
B.can’t be controlled as flexibly as the separate pump system
C.can be controlled as flexibly as the separate pump system
D.can be controlled more precisely and flexibly
