单选题A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.Aexpansion ratioBpressure ratioCcompression ratioDclearance ratio
单选题
A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.
A
expansion ratio
B
pressure ratio
C
compression ratio
D
clearance ratio
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