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.JointD.Standpipe

题目

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.String

B.Stand

C.Joint

D.Standpipe

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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 jointD standpipe

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The connected joints of pipe,usually made of three joints of pipe approximately 90 feet lo

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