The kindhearted man,who thinks ________his duty to help poor people,is popular with many people who know him.
A:it
B:that
C:one
D:this
请回答下列问题:
如图所示的电路中,电阻R1的阻值是5欧姆,干路中的电流I是0.5安培,电阻R2两端的电压是2伏特.求:
(1)通过R1的电流.
(2)通过R2的电流.
(3)R2的电阻值.
一次函数y1=kx+b与y2=x+a的图象如图,则下列结论:①k<0;②a>0;③当x>2时,y2>y1,其中正确的个数是( )