单选题The joint of the riser in a marine riser system that compensates for heave，the up-and-down motion of a floater，is the（）.Aflex jointBslip jointCheave jointDriser joint
单选题
The joint of the riser in a marine riser system that compensates for heave，the up-and-down motion of a floater，is the（）.
A
flex joint
B
slip joint
C
heave joint
D
riser joint
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