[填空题]
An ammeter whose intec mzq:(cqmz*99mnm* 5,/ ceymo 1b8b a3ltw lkrnavla21aoy-2eg l resistance 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$
