back angleback cone angle背: body's back錐: awl awl-shaped things角: role; part; character背錐: back cone ； normal cone; normal cone錐角: angle of cone; angle of taper; cone angle; coning angle; taper angle; wedge slope; whole conical angle下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯
