对在用钻机井架的可靠性进行鉴定是保证钻井作业安全的一项重要工作。

Making reliability appraisal for the on-site rig derrick is an important work to ensure salty in drilling.

youdao

对在用钻机井架的可靠性进行鉴定是保证钻井作业安全的一项重要工作。

Making reliability appraisal for the on-site rig derrick is an important work to ensure salty in drilling.

youdao