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Type-Ia supernovae are used as the standard candles to derive the luminosity distance $D_L(z)$, and ultra-compact radio sources are used as the standard rulers to obtain the angular diameter distance $D_A(z)$. We write the deviation of distance duality relation as $D_A(z)(1+z)^2/D_L(z)=\\eta(z)$. Specifically, we use two parameterizations of $\\eta(z)$, i.e. $\\eta_1(z)=1+\\eta_0 z$ and $\\eta_2(z)=1+\\eta_0 z/(1+z)$. 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Type-Ia supernovae are used as the standard candles to derive the luminosity distance $D_L(z)$, and ultra-compact radio sources are used as the standard rulers to obtain the angular diameter distance $D_A(z)$. We write the deviation of distance duality relation as $D_A(z)(1+z)^2/D_L(z)=\\eta(z)$. Specifically, we use two parameterizations of $\\eta(z)$, i.e. $\\eta_1(z)=1+\\eta_0 z$ and $\\eta_2(z)=1+\\eta_0 z/(1+z)$. 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