單項選擇題A set of clamps that are latched onto the drill pipe to allow the driller to raise or lower the drill string out of or into the hole are the().

A.lifts
B.collars
C.elevators
D.clamps


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3.單項選擇題A semisubmersible with a negative GM flops to an angle of().

A.heel
B.trim
C.list
D.loll

4.單項選擇題A semisubmersible which flops between forward and aft angles of trim is likely to have().

A.KML less than KGL
B.an off-center LCG
C.LCG greater than LCB
D.KML greater than KMT

5.單項選擇題A semisubmersible rig under tow should be ballasted down if().

A.motion begins to be excessive
B.water begins to break over the pontoons
C.period of roll exceeds 12 seconds
D.forward progress is halted by head wind