如图所示,R1=4 Ω,R2=8 Ω,接在电源上时,电压表的示数为2V,求电路消耗的总电功率是多少?
3W
Deeply his unhappy childhood, the boy’s seemed quite odd and strange.
A.relating to; characters
B.associated with; personality
C.linked by; virtues
D.connecting to; morality
读“地震波波速与地球内部构造图”(如图),回答问题。
岩石圈位于()
A.a顶部
B.b顶部
C.a和b顶部
D.b和c顶部