A:face
B:mouth
我国在南极极地地区建立的第一个科考站为( )
如图所示的是将复杂电路等效一个简单电路的过程,已知:R2=R3=10Ω,R1=5Ω,则可知R23= ____Ω,R123= ____Ω
I don't think it is _____ useless competition, because it has offered us ____valuable experience for the next competition.