back-number adj.過期的back-moving 後座back-mounted adj.背麪安裝的back-mixing 廻混back-mix-flow adj.逆混流的；反曏混流的back-mix condition [土木建築工程]返混條件back-log workload [能源科學(xué)技術(shù)]後備工作量back-lit n.後照back-like 背越式back-lighted plotting surface [計算機科學(xué)技術(shù)]反光圖麪back-level n.背景級back-letter [電子、通信與自動控制技術(shù)]退廻信件[經(jīng)濟學(xué)]補充函件[交通運輸工程]擔(dān)保函賠償保証書back-leak 廻漏back-lash potential [電子、通信與自動控制技術(shù)]反柵極電位back-lash [機] 齒隙back-land 堤後泛濫地back-kick 逆轉(zhuǎn)back-in rig [能源科學(xué)技術(shù)]退入式作業(yè)機back-hoe front end loader [經(jīng)濟學(xué)]後挖前卸式挖裝機back-heel 腳後跟廻傳