1. alternating current impedance techniques 
   交流阻抗技术
2. alternating direction implicit method 
   交替方向隐式法
3. power in alternating circuit 
   交流电路中的功率
4. Having alternating currents of two different frequencies that are combined to produce two new frequencies, the sum and difference of the original frequencies, either of which may be used in radio or television receivers by proper tuning or filtering. 
   外差的由两股不同频率的交替电流联合产生两个新的频率的，原频率的总和及差拍均可通过适当调频或滤波用于无线电或电视接收
5. Conversion of alternating to unidirectional current. 
   整流交流电转变到单向电流

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• 1. 交错和
  alternating series test 交错级数检验...alternating sum 交错和...alternating tensor 交错张量
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• 2. 平方和矩阵
  {n.}代数和 alpha matrix of the sum of squares...α平方和矩阵 alternating sum...交错总和,交错和 an enormous sum of money
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• 3. 交错总和
  交错路段 alternating runs...交错总和 alternating sum...交代式 alternate expression
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