Main Applications: Suitable for vertical well drilling hoisting. Cage channel of vertical well drilling, port load and unload derrick, and tower crane.是什么意思_Main Applications: Suitable for vertical well drilling hoisting. Cage channel of vertical well drilling, port load and unload derrick, and tower crane.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句