Standard data chain and CRC-16 check mode are used in inquiry control by the central station at the drilling company.
数据网由中心站（钻井公司）采用轮询方式控制，使用标准的数据链路控制规程，和CRC-16校验方式。
From a spare part to a comprehensive drilling system and from a generic valve to a fully integrated supply chain process, National Oilwell Varco delivers unlimited customer solutions.
从一个备件到一套完整钻井系统，从一个普通的阀门到一套集成的供应链程序，国民油井华高提供各种无限制的用户解决方案。
The result of calculation shows that qualified roller chains for drilling rigs are competent for the job on chain-drive pumping units.
计算结果表明，质量合格的石油钻机传动滚子链能胜任链条抽油机的传动。
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