alterantadj.改变的alterv.改变；更改；阉割；切除卵巢alternating current impedance交流阻抗alternating-current fan out交流扇出alternating current rectifier交流电整流器alternating voltage generator交流电压发电机alternating-pressure method频压法alternating aerobic/anoxic好氧／缺氧循环alternating voltage component交流电压成分alternating current voltmeter交咙特计alternating-current circuit交流电路alternation of nuclear phases核相交替