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单选题
The main function of tie rods in the construction of large, low speed diesel engines is to（）.
A
stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B
accept most of the tensile loading that results from the firing forces developed during operation
C
mount the engine frame securely to the hull to prevent shaft coupling misalignment
D
connect the crosshead solidly to the piston rod
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