單項(xiàng)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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1.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題The connecting rob is fitted between the crosshead and the crankshaftIt transmits the firing force, and together with the crankshaft convert the （） motion to a （） motion.

A.rotary；reciprocating
B.up and down；fore and aft
C.fore and aft；up and down
D.up and down；rotary