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 series of trays with sieves that vibrate to remove cu...

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（）.

A semisubmersible with a positive GM，and TCG located st...

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

A semisubmersible with a negative GM flops to an angle ...

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