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With singly-tagged $\bar D$ samples selected from the data collected at andaround 3.773 GeV with the BESII detector at the BEPC collider, we have measuredthe branching fractions for the inclusive $K^\pm$ decays of $D^+$ and $D^0$mesons, which are $BF(D^+\to K^-X) = (24.7 \pm 1.3 \pm 1.2)%$, $BF(D^+\to K^+X)= (6.1 \pm 0.9 \pm 0.4) %$, $BF(D^0\to K^-X) = (57.8 \pm 1.6 \pm 3.2) %$ and$BF(D^0\to K^+X) = (3.5 \pm 0.7 \pm 0.3) %$, respectively. We have alsomeasured the branching fractions for the inclusive semileptonic decays of $D^+$and $D^0$ mesons to be $BF(D^+ \to e^+ X)=(15.2 \pm 0.9 \pm 0.8)%$ and $BF(D^0\to e^+ X) =(6.3 \pm 0.7 \pm 0.4) %$. These yield the ratio of their partialwidths to be $\Gamma(D^+ \to e^+X)/\Gamma(D^0 \to e^+X)=0.95 \pm 0.12 \pm0.07$.

Direct Measurements of the Branching Fractions for Inclusive $K^\pm$ and Inclusive Semileptonic Decays of $D^+$ and $D^0$ Mesons