單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

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

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

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

The inner bottom is the（）.