单选题A distance piece, with ground faces, known as a compression plate, may be interposed between the rod and the beating housing, its thickness being chosen to ensure the correct （）.Acompression pressureBcompression testCcompression ratioDcompression clearance
单选题
A distance piece, with ground faces, known as a compression plate, may be interposed between the rod and the beating housing, its thickness being chosen to ensure the correct （）.
A
compression pressure
B
compression test
C
compression ratio
D
compression clearance
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