单选题The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.AbossBknuckleCskegDstrut
单选题
The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
A
boss
B
knuckle
C
skeg
D
strut
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