back weight 平衡錘；桿頭背面加重

back wave tube [經(jīng)濟(jì)學(xué)]返波管

back water curve [物理學(xué)]壅水曲線

back water 倒劃；退縮；退回原來(lái)立場(chǎng)

back washing agent [經(jīng)濟(jì)學(xué)]反萃劑

back wash line [能源科學(xué)技術(shù)]反洗管線

back wash

back ward impeller [交通運(yùn)輸工程]后彎葉輪

back ward edge [體育]后刃

back wall of burner [材料科學(xué)]小爐后墻

back wall 背壁，[車輛] 后壁

back walkover

back waist seam line [經(jīng)濟(jì)學(xué)]后腰縫線[紡織科學(xué)技術(shù)]后腰縫線褲后腰縫線

back vision 后視

back view mirror [車輛] 后視鏡

back view [機(jī)] 后視圖

back vent unmeet [紡織科學(xué)技術(shù)]背叉豁

back veneer [木] 里板

back valve 回動(dòng)閥， [機(jī)] 止回閥

back up ring 支承環(huán)