单选题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 （）.Aflat surfaceBmirror finishCsloping surfaceDinclined surface
单选题
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
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