河流平原相 streamplain facies

不平衡三相电流 unbalanced three phase current

流体相平衡 Fluid Phase Equilibria ; phase equilibrium of fluid

平衡多相电流 balanced polyphase current

不平均三相电流 unbalanced three-phase circuit

电流相位平衡保护装置 current phase-balance protection

流动相平均线速度 mean linear velocity of mobile phase