AC is composed of four states, as shown in Figure 2.
AC由四个状态组成，如图2所示。
As the transmission length reaches a certain distance, DC transmission becomes economically attractive over ac.
当输电距离足够长时，直流输电的经济性将优于交流输电。
As I said before, we know a lot about the AC Milan players anyway.
就像我说的，关于米兰的球员我知道很多。
Electrical AC drive is adopted as the drive system of Rotor Test Bed.
其拖动系统采用电力交流传动。
Electrical AC drive is adopted as the drive system of Rotor Test Bed.
其拖动系统采用电力交流传动。
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