短語詞組短語Drill -stem subs 鉆柱轉(zhuǎn)換接頭drill -stem m tester 鉆桿測試器drill l stem 鉆桿drill stem buckling 鉆柱彎曲drill stem bushing 方鉆桿補心drill stem test method 中途測試工具法 返回 drill stem