单项选择题
A.direct action of cam shaft B.compressed air pressure C.hydraulic “push rods” D.direct action of the main piston moving down
In a diesel engine, excessive cylinder liner wear will ...
In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove
A.(1) only is correct B.(2) only is correct C.both (1) and (2) are correct D.neither (1) or (2) axe correct
Engine displacement is equal to the cylinder （）.A.area ...
单项选择题Engine displacement is equal to the cylinder （）.
A.area times the stroke B.area times the stroke, times the number of cylinders C.volume times the stroke D.volume times the stroke, times the number of cylinders
Auxiliary boilers are divided into several classificati...
单项选择题Auxiliary boilers are divided into several classifications, one of which is （）.
A.water-tube supercritical circulation B.water-tube forced circulation C.fire-tube controlled circulation D.fire-tube express circulation
