[填空题]
Electrocardiographs are often connected as shown uk*le611xkqjiy 29 9c bsx5n qin .kpl0 k3g6 /mk1o u;pjg/mjk i(Fig. Below). The leads are said to be capacitively coupled. A time constant of 3.0 s is typical an um0jjiogkmg36k 1 l/ppk /.k;d allows rapid changes in potential to be recorded accurately. If $C\,=\,3.0\mu F$, what value must R have? [Hint: consider each leg as a separate circuit.] $ \times10^{6 }\;\Omega$
