英语词典
The working characteristic of wire rope for well drilling, and the use conditions, structure, specification and production technology requirements of large diameter wire ropes for drill oil derrick base rising are analyzed.
分析钻井用钢丝绳的工作特点,钻机井架底座起升用粗直径钢丝绳的使用工况条件、结构、规格和生产技术要求;
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