tiger, elephant, lion, horse, panda, monkey, cat, dog
(2015•泉州)读图,图中大致为我国南方与北方的分界线是( )
如图所示,电源电动势E=6V,内阻r=1Ω,电阻R1=2Ω,R2=3Ω,R3=7.5Ω,电容器电容C=4μF,开关S原来断开,现在合上开关S到电路稳定,则( )