[填空题]
Electrocardiographs are often connected as shown in (Fig. Below). Thh/y5(zovs + lz/kyt/g e sh9trje1p4 fnd.5 p4 cqfv)(j leads are said to be capacitively coupled. A time constant of 3.er j45p) cht1 jv4(dp. 9nffsq0 s is typical and 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$
