第一级: first order; first step; fir ...反射: reflect一级反射: first order reflection第一级额反射: primary extra reflection伪一级反应: pseudo first-order reaction一级反应: first order reaction; first-order effect; primary response一级反致: renvoi au permier degree准一级反应: pseudo first order reaction; pseudo-first order reaction假一级反应；准一级反应: pseudo-first-order reaction拟一级反应,假一级反应,伪一级反应: pseudo first-order reaction次级反射: secondary reflection第二级反射: second order reflection第三级反射: third order reflection多级反射: higher order reflection; higher order reflex; superior reflex二级反射: reflex of second order; secondary reflex奇级反射: odd-order reflections三级反射: tertiary reflex第一级: first order; first step; first stage一级反应动力学: first order reaction kinetics第一级光谱，第一级谱: first order spectrum假一级反应速率定律；准一级反应速率定律: pseudo-first-order rate law第一级侧脉: lateral vein of the first order第一级产业: primary sector of economic activity第一级次: first order第一级导叶: first stage guide vane
