[填空题]
Electrocardiographs are often conn(.dft ku 5j /,lpug.yb2c ;yvoec rtz2yh85 g*lamybq+ l(0tfo6ted as shown in (Fig. Below). The leads are said to be capacitively coupled. A time constant of 3. 8 (zmyqly0rtlg25b6 *oaht+f0 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$
