derrick telescoping
常見例句
- The structure of the derrick is triple-section telescoping structure, substructure is parallelogram structure, can be lifted by hydraulic cylinder.
井架采用三節(jié)伸縮式結(jié)構(gòu)，底座采用平行四邊形結(jié)構(gòu)，能用液缸整體起升。
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