heavy and lengthy derrick,heavy derrick是什么意思


中文翻译重吊杆

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1)heavy and lengthy derrick,heavy derrick,重吊杆2)derrik;boom,起重吊杆3)heavy derrick stool,重吊杆座4)non-articulated boom,无关节起重吊杆5)heavylift derrick boom,jumbo derrick boom,重型起重吊杆6)crane hook,起重吊钩

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