A.起始段 B.中間段 C.三分之一至末端 D.任意段
A.3200VA B.2400VA C.4000VA D.5656VA
如圖所示電壓的瞬時表達式為()。
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