单选题The bedplate must be flexible enough to hog and sag with the foundation plate （） it is attached and which forms part of the ship’s structure.Ain whichBon whichCto whichDby which
单选题
The bedplate must be flexible enough to hog and sag with the foundation plate （） it is attached and which forms part of the ship’s structure.
A
in which
B
on which
C
to which
D
by which
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