词汇	parabolic sector
释义	parabolic sector 抛物扇形域
随便看	vertical shaft furnace vertical shaft generator vertical shaft hammer crusher Vertical shaft impact crusher vertical-shaft impact crusher vertical shaft impactor vertical shaft inner wall construction vertical shaft intake vertical shaft liner vertical shaft lining vertical shaft machine vertical shaft mechanical model vertical shaft mixer vertical shaft motor vertical shaft rotary plough vertical shaft rotary plow vertical shafts vertical shaft seal vertical shaft sinking vertical-shaft spillway vertical shaft turbine vertical-shaft turbine vertical shaft type vertical shaft uncovering coal vertical shaft wall