back room 密室back roll 后輥；反繞；背輥；倒卷back road 支路；僻徑；鄉(xiāng)村小道back rise seam [紡織科學(xué)技術(shù)]后襠縫back rise line [紡織科學(xué)技術(shù)]后襠線back rise 后浪back ripple current [計(jì)算機(jī)科學(xué)技術(shù)]逆向脈動(dòng)電流back ring 襯結(jié)back ridge 閉壟back rest 靠背架；固定中心架back resistance meter 反向電阻測量計(jì)back reflection camera [地球科學(xué)]逆反射照相機(jī)back reflection 背射；背向反射；背射法back reaming [能源科學(xué)技術(shù)]倒劃眼back read 反向讀back reaction 逆反應(yīng)back range 尾距back rake angle 縱向前角back rake 背斜角，[機(jī)] 后傾角back pull wire drawing-machine [經(jīng)濟(jì)學(xué)]反拉力拉絲機(jī)