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5to6kmof4'"这里面的这个符号'"是什么意思原句是AsabUnit6/7Development-thescopeincludestie-inof8GasLiftwells,eachwellwillhave5to6kmof4'"dia.pipelineandonewaterinjectioncluster(comprisingofwaterinje

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5 to 6 km of 4'" 这里面的这个符号'"是什么意思
原句是 Asab Unit 6/7 Development- the scope includes tie-in of 8 Gas Lift wells ,each well will have 5 to 6 km of 4'" dia.pipeline and one water injection cluster ( comprising of water injection pump,power skid ,elect submersible pump with water injection pipelines.)
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直径的意思