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滚子减阻扶正器
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滚子减阻扶正器
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井下工具
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friction reduction stabilizer
滚子减阻扶正器
将钻柱与井壁间的滑动摩擦转变为滚动摩擦,用以减小钻柱下行阻力的工具。
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public key infrastructure, PKI
public-key system
Public knowledge Management
Publick Occurrences, Both Foreign and Domestick
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Public Land in Palau
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Public Law 480 Program
public lending right
Public Lending Right Act 1979
public liability insurance
Public Libraries and Museums Act
public libraries in the thermaes
Public Libraries Law of the People's Republic of China
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Public library construction standards
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public library service system
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