單項(xiàng)選擇題

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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The athwartship hull structural members of a ship are（）.

A.stringers
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The antennas of the trucks on deck are not fitted（）.

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