圖示電路在開關(guān)S閉合后的時間常數(shù)τ值為()
A.0.1s B.0.2s C.0.3s D.0.5s
圖示電路在t=0時開關(guān)閉合,t≥0時u(t)為:()
A.-100(1-)V B.(-50+50)V C.-100V D.-50(1-)V
電路如圖所示,則電路的時間常數(shù)為:()
A.(5/16)s B.(1/3)s C.3s D.2s