单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
