有一正弦电动势e的周期为2ms,最大值为230V,若t=0时其瞬时值为-115V,则e的瞬时值表达式是()
A.230sin(314t-30°)V
B.230sin(314t+30°)V
C.230sin(3140t-30°)V
D.230sin(3140t+30°)V
正确答案:A
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