Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.<br>A:to stiffen<br>B:to soften<br>C:to loosen<br>D:to wear

Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.
A:to stiffen
B:to soften
C:to loosen
D:to wear

出自：海船船员证

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