某三相电源的电动势分别为e(来学网)=20sin(314t+16°)V,e=20sin(314t-104°),e=20sin(314t+136°)V,当t=13s时,该三相电动势之和为( )V。
  • A.
    (来学网)20
  • B.
    20/(来学网)
  • C.
    (来学网)0
  • D.
    20(来学网)]