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循环阀
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循环阀
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circulating sub
循环阀
在测试结束后,可为环空和管柱之间建立循环通道,用于替出管柱中的地层流体和循环压井作业的阀门。
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singularly perturbed system
singularly perturbed systems
singular manifold
singular mapping
singular matrix
singular measure
singular metric
singular model
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singular one parameter subgroup
singular one-parameter subgroup
singular operator
singular optimal control
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singular ordinal
singular ordinal number
singular parabolic equation
singular part
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singular periodic solution
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