单项选择题
A.too low B.a little lower C.a little higher D.exactly the same
If a cam-controlled engine has a normal injection press...
单项选择题If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.
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
