high tensile steel derrick

基本解释重型钻塔

网络释义

1)high tensile steel derrick,重型钻塔2)A-type derrick,A型钻塔3)heavy-duty drilling rig,重型钻机4)heavy duty ratchet bit brace,重型弓型钻5)tower crane,塔型起重机6)heavy-duty jobber length drill,重型长钻头

用法和例句

Evaluation on the varieties and structures of wire rope used on heavy-duty drilling rig;

重型钻机提升用钢丝绳的品种与结构评析

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