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單項選擇題Because of the resulting higher pressures in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made （） at the top to accommodate the higher stresses, and prevent cracking of the material.

A.thinner
B.thicker
C.smoother
D.rougher

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1.單項選擇題Oil is supplied to the crosshead using a swinging arm or a （） and is sometimes boosted in pressure to and efficient lubrication.

A.telescopic pipe
B.large bore pipe
C.generating pipe
D.central pipe

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2.單項選擇題Because of the high loads the bearing material is a tin- aluminum alloy bonded to a steel shellThe crosshead pin is highly polished to a （）.

A.flat surface
B.mirror finish
C.sloping surface
D.inclined surface

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3.單項選擇題The load on the crosshead pin is always （）, so it is the （）half of the bearing which is subject to wear.

A.upwards；top
B.upwards；bottom
C.downwards；top
D.downwards；bottom

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4.單項選擇題Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.

A.accelerates；decelerates
B.accelerates；accelerates
C.decelerates；decelerates
D.decelerates；accelerates

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5.單項選擇題The slippers run （） in the crosshead guides as the piston and rod are （）and prevent the top of the connecting rod from moving sideways.

A.up and down；reciprocating
B.up and down；rotating
C.back and forth；reciprocating
D.back and forth；rotating

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