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high frequency reciprocating rig
mech. 高频冲击【往复式】钻机
 English thesaurus
High Frequency Reciprocating Rig Lubricity Testing of Diesel Fuels
abbr., oil HFRR (пример: http://www.intertek-cb.com/newsitetest/news/hfrrlubricitytest.shtml philib)

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