单项选择题

A.transport tubulars from the pipe racks to the derrick……

The main function of the drawworks on a ship is to（）.

A.transport tubulars from the pipe racks to the derrick floor
B.maintain constant tension on the marine riser
C.store and secure the excess drill line
D.lower and hoist the drill string into and out of the drilled hole

<上一题目录下一题>

热门试题

单项选择题The joint formed when two steel plates are placed end-to-end is called a（）.

A.bevel
B.seam
C.butt
D.bond

单项选择题The inner bottom is the（）.

A.tank top
B.compartment between the tank top and shell of the vessel
C.inner side of the vessel's shell
D.space between two transverse bottom frames

单项选择题The flood stream here is at an average rate of 0.8（）.

A.cables
B.miles
C.kilometers
D.knot

单项选择题The construction portfolio may be included as part of the ship（）.

A.general plans
B.operating manual
C.builders documentation
D.CCS file

单项选择题The circular steel structure installed around the propeller of a towboat is the（）.

A.nozzle
B.shroud
C.strut
D.hood