“crown block”的概念、定义、翻译、参考文献-科学参考

单词	crown block
释义	crown block [`krau̇n ´bläk] ^{PETROLEUM ENGINEERING} A wooden or steel beam joined to the tops of derrick posts of an oil well to support pulleys.
随便看	repair repair cycle repair dock repair forecast repair kit repair parts list repair synthesis repand repeatability repeat accuracy repeated load repeated measurements model repeated reflection repeated root repeated twinning repeater repeater compass repeater jammer repeater station repeat glass repeating coil repeating-coil bridge cord repeating decimal repeating unit repeat key

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