backwarder 小生產(chǎn)者backwarddirected adj.方向向后的backwardation n. 交割延期費；[貿(mào)易] 現(xiàn)貨溢價backward-wave crossed-field amplifier [電子、通信與自動控制技術(shù)]返波正交場放大管backward-wave n.反向波backward-surging adj.逆涌；后涌backward-substitution n.反向置換backward-studying 向后學(xué)習(xí)backward-security 后向安全backward-looking adj. 保守的；退縮的；回顧過去的backward-forward counter [計算機科學(xué)技術(shù)]雙向計數(shù)器正反向計數(shù)器backward-facing step flow [機械工程]后臺階流動backward-driven n.后向驅(qū)動backward-directed adj.方向向后的backward-compatible adj. 反向兼容，逆向相容backward-bladed aerodynamic fan [機械工程]后彎葉片風(fēng)機backward-bias [電] 逆向偏壓backward-acting n.逆向作用backward welding 反手焊backward wave oscillator tube 返波振蕩管