單項(xiàng)選擇題

如圖所示電壓的瞬時(shí)表達(dá)式為()。

A.u=10sin(50πt-π/4)V
B.u=10sin(50πt+π/4)V
C.u=10sin(100πt-π/4)V
D.u=10sin(100πt+3π/4)V


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