... machine improvement time 机器装配时间 machine in normal service 常用机器 machine interface 机器接口 ...
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machine dimensions in normal service 常用机器
By analyzing the wind disaster of oil rig derrick, the basic reasons of the By analyzing normal work or falls in the service drilling machine derrick in oilfield were analyzed.
从石油井架风灾害分析入手，客观分析了油田在役钻机井架不能正常工作或倾倒的根本原因。
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