“Lift installation by derrick barge”的概念、定义、翻译、参考文献-科学参考

单词	Lift installation by derrick barge
释义	Lift installation by derrick barge Encyclopedia 工学传统安装方法释 Lift installation by derrick barge吊机下放安装法在吊机满足工作水深的情况下直接用吊机缆绳下放；当水深超出吊机工作水深范围时，采用吊机起吊，转移到绞车缆绳，下放到海床的安装方法。
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