单项选择题
A.a little lower B.a little higher C.too low D.exactly the same
The main purpose of changing main engine to electronic ...
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
To meet the market requirements, a marine diesel engine...
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
The common rail engines show great advantages in combus...
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
