单项选择题
The device that allows a floating ship to sway without bending the marine riser system is the（）.
A.yaw joint
B.sway joint
C.slip joint
D.flex or ball joint
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A.lay
B.lies
C.being lain
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A.frostbite
B.skin burns
C.asphyxiation
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The bottom row of plating next to the keel of a lifeboat is known as the（）.
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