单选题Bedplates are the （） of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.AhullBprojectionCgraphitizationDfoundation
单选题
Bedplates are the （） of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.
A
hull
B
projection
C
graphitization
D
foundation
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