常見例句雙語例句Some Speed lifting Systems of domestic raise-boring machines are described. Based upon an analysis of their functions, some recommendations for their improvement are proposed.本文介紹了國內(nèi)天井鑽機的幾種快速陞降系統(tǒng)及其作用竝對其進行了分析，提出了改進建議。 返回 raise boring machine