单项选择题
The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A.direct action of cam shaft B.compressed air pressure C.hydraulic “push rods” D.direct action of the main piston moving down
单项选择题 In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove
单项选择题 Engine displacement is equal to the cylinder （）.
单项选择题 Auxiliary boilers are divided into several classifications, one of which is （）.
