A:to be sounded
B:to sound
C:to being sounded
D:to have sounded
如图所示的电路中,电源电压保持不变,R1=30Ω,R2=20Ω,电流表的示数为0.2A,则R1、R2串联后的总电阻为____ Ω,电源电压为____ V,R1两端分得的电压为____ V.
点P1(x1,y1)、P2(x2,y2)是一次函数y=5x+10的图象上两点,且x1<x2,则y1﹣y2( )