题目不难画出共模等效电路就明白了
Au＝-β(Rc//Rl)/(Rb＋rbe＋2×(1＋β)Re)
var projection = d3.geo.albers() .center([0, 55.4]) .rotate([4.4, 0]) .parallels([50, 60]) .scale(6000) .translate([width / 2, height / 2]).
去
