“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	Peano's postulates peanut peanut oil pea ore pear pearceite pearl pearl ash pearl essence pearl hardening pearlite pearl moss Pearl-Reed curve pearl sinter pearl spar pearlstone pearl white pearly pearly tumor pear-shape cut Pearson Type I distribution pea-soup fog peat peat ball peat bed

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