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单选题
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
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单选题The main function of the drawworks on a ship is to（）.A
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单选题The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.A
stringB
standC
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tool jointC
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单选题What is a spill pipe?（）A
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单选题The shear rams of a ship blowout preventer stack are used in emergency well control to（）.A
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close and seal around casingC
cut off pipe inside the preventer stackD
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单选题（）(除了) the fire drill, there are also boat drill and emergency drill on board.A
ExceptB
AlthoughC
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But
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单选题An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.A
shear ramB
blind ramC
pipe ramD
annular ram
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单选题In order to prevent stress from being set up in the metal, expansion joints are fitted which _____ the stress by allowing the pipe to expand or contract freely.A
reclaimB
reconcileC
rectifyD
relieve
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