如图所示,是两个电阻R1、R2的U-I图线,它们并联的电阻阻值为R,则R的U-I图线在图中( )
A:区域Ⅰ
B:区域Ⅱ
C:区域Ⅲ
D:不能确定
如图所示,甲、乙两表的示数分别是( )
It's very hot today. What about to swim?