单项选择题

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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单项选择题

A.stringers
B.girders
C.breasthooks
D.deck beams

单项选择题

A.in
B.on
C.out
D.with

单项选择题

A.cargo handling machines
B.deck winches and derricks
C.engine-room tools
D.course controlling system