短語詞組短語bottom detection angle 下探探測角度bottom tangent angle 下切角bottom support angle 底角板bottom keel angle 龍骨角鋼;主龍骨底角材bottom hole angle [礦業(yè)]孔底角main -taper bottom hole angle 主錐井底角sidewall bottom angle [船]側壁底升角bottom m keel angle 龍骨角鋼balloon bottom angle 氣圈底角 返回 bottom angle