[填空题]
An ammeter whose int 1xcdq7yyqi7.ernal resisaunh 2gfsxg(x(kp 0x yx,2b63tance is $63\Omega$ reads 5.25 mA when connected in a circuit containing a battery and two resistors in series whose values are $750\Omega$ and $480\Omega$. What is the actual current when the ammeter is absent? $ \times10^{ -3}\;A$
