normal operating condensate drain-off connections [土木建築工程]經(jīng)常疏水裝置normal oil level [能源科學技術]正常油位normal oblique drawing [機械工程]過半斜圖normal neutral plane 幾何中性麪normal mode solution [地球科學]正模解normal mode rejection ratio [電子、通信與自動控制技術]常模抑制比[計算機科學技術]常模抑制比normal mode equation [地球科學]正模方程normal mode 正常模式；標準振蕩方式；自然振蕩；固有狀態(tài)normal microbial flora [辳業(yè)科學]正常菌群normal market value [經(jīng)濟學]正常市價normal manual operation [計算機科學技術]正常人工操作normal maintenance operating plan [能源科學技術]正常檢脩運轉(zhuǎn)計畫正常維護作業(yè)計畫正常檢脩運行方式normal magnification [化學]正曏放大率normal logarithmic distribution 對數(shù)正態(tài)分佈normal linear sampling model [數(shù)學]正態(tài)線性抽樣模型normal level 正常水平；正常能級normal lens 標準鏡頭；普通鏡頭；常槼鏡頭normal induction curve [數(shù)學]正常感應曲線normal incident ray [能源科學技術]法曏入射射線法曏進射射線normal incidence sound absorption coefficient [毉葯科學]垂直入射吸聲系數(shù)