A set of clamps that are latched onto the drill pipe to

单项选择题

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

相关考题

单项选择题 A series of trays with sieves that vibrate to remove cuttings from the circulating fluid in rotary drilling operations is called the（）.

单项选择题 A semisubmersible with a positive GM，and TCG located starboard of the centerline，inclines to an angle of（）.

单项选择题 A semisubmersible with a negative GM flops to an angle of（）.

经营许可证号：湘B2-20140064

常规海事声明与延伸海事声明