单项选择题
The diameter of a piston is usually less at the crown than at the skirt, in order to （）.
A.facilitate the installation of piston rings
B.allow for the expansion of the piston during operation
C.prevent crankcase vapors from entering the combustion chamber
D.reduce wearing of the upper cylinder liner
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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
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In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and groove
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Engine displacement is equal to the cylinder （）.
A.area times the stroke
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