单项选择题
A.Lower fuel consumption B.Better balanced cylinder power C.A shorter overhaul period D.Less smoke emission
If a camshaft-less engine has a normal injection pressu...
单项选择题If a camshaft-less engine has a normal injection pressure at rated speed, the injection pressure will be at slow speed（）
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
