[填空题]
The capacitance of a portiozc+ :6c(rg0shraz,q bg3 l0o an of a circuit is t02+uwy+0 dt0orocdl uo be reduced from 4800 pF to 2900 pF.
dw l0ou20tc ur++d0 yo What capacitance can be added to the circuit to produce this effect without removing existing circuit elements? $ \times10^{ -9}\;F$
Must any existing connections be broken in the process?