单选题Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.Ato stiffenBto softenCto loosenDto wear
单选题
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
参考解析
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