石油开采用于井下压裂的添加剂.
Used as additive for under - well fracturing in petroleum mining.
dict.youdao.com地面和井下的火灾、水害；
Fire and flood on surface and underground;
www.tingliku.com井下拔拉试验证明其锚固可靠.
Its anchoring reliability has been proved by underground pull - out test.
dict.cnki.net井下拔拉试验证明其锚固可靠。
Its anchoring reliability has been proved by underground pull-out test.
dict.cnki.net悬挂井下控制油嘴/速度阀；
To suspend storm chokes/velocity valves;
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