[填空题]
Suppose that you wish to apply anj.js l5 kcn juw17e6i5sl/.e 0.25-V potential +inx ,f7i bd.tdifference between two points on the human body. The resis,itdbx 7 +fin.tance is about $2000\Omega$, and you only have a 9.0-V battery. How can you connect up one or more resistors to produce the desired voltage? k$\Omega$
