单选题The load on the crosshead pin is always （）, so it is the （）half of the bearing which is subject to wear.Aupwards；topBupwards；bottomCdownwards；topDdownwards；bottom
单选题
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
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