题目

如图所示，＝3000，电压表1的内阻为6000，电压表2的内阻为3000. 已知断开，接1时，电压表1的读数是4V；闭合, 接1时,电压表1的读数是8V；闭合，接2时，电压表2的读数是7.5V，求的阻值． 答案：   解析:With all the problems ______, the manager went home and had a good rest.A.solvedB.to solveC.solveD.solving